Feature - Add puglin to support Amplitude

packages/plugins/plugin_amplitude/.gitignore

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+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+migrate_working_dir/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+# Libraries should not include pubspec.lock, per https://dart.dev/guides/libraries/private-files#pubspeclock.
+/pubspec.lock
+**/doc/api/
+.dart_tool/
+.packages
+build/

packages/plugins/plugin_amplitude/.metadata

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+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: "761747bfc538b5af34aa0d3fac380f1bc331ec49"
+  channel: "stable"
+
+project_type: app
+
+# Tracks metadata for the flutter migrate command
+migration:
+  platforms:
+    - platform: root
+      create_revision: 761747bfc538b5af34aa0d3fac380f1bc331ec49
+      base_revision: 761747bfc538b5af34aa0d3fac380f1bc331ec49
+    - platform: android
+      create_revision: 761747bfc538b5af34aa0d3fac380f1bc331ec49
+      base_revision: 761747bfc538b5af34aa0d3fac380f1bc331ec49
+    - platform: ios
+      create_revision: 761747bfc538b5af34aa0d3fac380f1bc331ec49
+      base_revision: 761747bfc538b5af34aa0d3fac380f1bc331ec49
+    - platform: linux
+      create_revision: 761747bfc538b5af34aa0d3fac380f1bc331ec49
+      base_revision: 761747bfc538b5af34aa0d3fac380f1bc331ec49
+    - platform: macos
+      create_revision: 761747bfc538b5af34aa0d3fac380f1bc331ec49
+      base_revision: 761747bfc538b5af34aa0d3fac380f1bc331ec49
+    - platform: web
+      create_revision: 761747bfc538b5af34aa0d3fac380f1bc331ec49
+      base_revision: 761747bfc538b5af34aa0d3fac380f1bc331ec49
+    - platform: windows
+      create_revision: 761747bfc538b5af34aa0d3fac380f1bc331ec49
+      base_revision: 761747bfc538b5af34aa0d3fac380f1bc331ec49
+
+  # User provided section
+
+  # List of Local paths (relative to this file) that should be
+  # ignored by the migrate tool.
+  #
+  # Files that are not part of the templates will be ignored by default.
+  unmanaged_files:
+    - 'lib/main.dart'
+    - 'ios/Runner.xcodeproj/project.pbxproj'

packages/plugins/plugin_amplitude/README.md

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+# segment_analytics_plugin_amplitude
+
+`DestinationPlugin` for [amplitude](https://amplitude.com/docs/sdks/sdk-quickstart). Wraps [`amplitude_analytics`](https://pub.dev/packages/amplitude_analytics).
+
+## Installation
+
+Manually add this package to your `pubspec.yaml` file.
+
+```yaml
+dependencies:
+  analytics_plugin_amplitude:
+    git:
+      url: https://github.com/segmentio/analytics_flutter
+      ref: main
+      path: packages/plugins/plugin_amplitude
+```
+
+## Usage
+
+Follow the [instructions for adding plugins](https://github.com/segmentio/analytics_flutter_#adding-plugins) on the main Analytics client:
+
+In your code where you initialize the analytics client call the `.add(plugin)` method with an `amplitudeDestination` instance.
+
+```dart
+import 'amplitude_options.dart';
+import 'package:segment_analytics/client.dart';
+import 'package:segment_analytics_plugin_amplitude/plugin_amplitude.dart'
+    show amplitudeDestination;
+
+const writeKey = 'SEGMENT_API_KEY';
+
+class _MyAppState extends State<MyApp> {
+  final analytics = createClient(Configuration(writeKey));
+
+  @override
+  void initState() {
+    // ...
+
+    analytics
+        .addPlugin(amplitudeDestination());
+  }
+}
+```
+
+## Support
+
+Please use Github issues, Pull Requests, or feel free to reach out to our [support team](https://segment.com/help/).
+
+## Integrating with Segment
+
+Interested in integrating your service with us? Check out our [Partners page](https://segment.com/partners/) for more details.
+
+## License
+
+```
+MIT License
+
+Copyright (c) 2023 Segment
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+```

packages/plugins/plugin_amplitude/analysis_options.yaml

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+include: package:flutter_lints/flutter.yaml
+
+# Additional information about this file can be found at
+# https://dart.dev/guides/language/analysis-options

packages/plugins/plugin_amplitude/lib/pulgin_amplitude.dart

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+import 'package:segment_analytics/analytics.dart';
+import 'package:segment_analytics/event.dart';
+import 'package:segment_analytics/plugin.dart';
+import 'package:amplitude_flutter/identify.dart';
+import 'package:amplitude_flutter/amplitude.dart';
+
+class AmplitudePlugin extends DestinationPlugin {
+  final String apiKey;
+  final String instanceName;
+  late Amplitude _amplitudeInstance;
+
+  AmplitudePlugin(this.apiKey, this.instanceName) : super('amplitude') {
+    _amplitudeInstance = Amplitude.getInstance(instanceName: instanceName);
+  }
+
+  @override
+  void configure(Analytics analytics) {
+    super.configure(analytics);
+    _amplitudeInstance.init(apiKey);
+  }
+
+  @override
+  Future<RawEvent?> track(TrackEvent event) async {
+    await _amplitudeInstance.logEvent(event.event, eventProperties: event.properties);
+    return event;
+  }
+
+  @override
+  Future<RawEvent?> identify(IdentifyEvent event) async {
+    await _amplitudeInstance.setUserId(event.userId);
+    if (event.traits != null) {
+      final Identify identify = Identify();
+      await Future.wait(event.traits!.toJson().entries.map((entry) async {
+        identify.set(entry.key, entry.value.toString());
+      }));
+      _amplitudeInstance.identify(identify);
+    }
+    return event;
+  }
+
+  @override
+  Future flush() async {
+    _amplitudeInstance.uploadEvents();
+  }
+
+  @override
+  void reset() {
+    _amplitudeInstance.setUserId(null);
+    _amplitudeInstance.clearUserProperties();
+  }
+
+}

packages/plugins/plugin_amplitude/pubspec.yaml

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+name: segment_analytics_plugin_amplitude
+description: "amplitude plugin."
+version: 1.0.0
+homepage: https://github.com/segmentio/analytics_flutter#readme
+repository: https://github.com/segmentio/analytics_flutter/tree/main/packages/plugins/plugin_amplitude#readme
+issue_tracker: https://github.com/segmentio/analytics_flutter/issues
+
+environment:
+  sdk: '>=2.19.3 <4.0.0'
+  flutter: ">=1.17.0"
+
+dependencies:
+  flutter:
+    sdk: flutter
+  segment_analytics: ^1.0.0
+  json_annotation: ^4.8.0
+  amplitude_flutter: ^3.13.0
+
+dev_dependencies:
+  build_runner: ^2.3.3
+  json_serializable: ^6.6.0
+  flutter_test:
+    sdk: flutter
+  flutter_lints: ^2.0.0
+
+flutter:
+