[feat]: Add OTLP HTTP/JSON traces exporter

[MikeGoldsmith]

Description

Adds a OTLP HTTP/JSON exporter. Currently only exports trace data, but can be expanded to add metrics and logs too.

Fixes #1003

NOTE: I've created as a draft to gather feedback and will add more tests. Also needs lint rules applied too.

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Add simple Unit Test to verify JSON output, want to add more

Does This PR Require a Contrib Repo Change?

• Yes. - Link to PR:
• No.

Checklist:

• Followed the style guidelines of this project
• Changelogs have been updated
• Unit tests have been added
• Documentation has been updated

[methane]

encoding="utf-8"

[methane]

Suggested change

	data = zlib.compress(bytes(serialized_data))
	data = zlib.compress(serialized_data.encode())

>>> bytes("foo")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: string argument without an encoding

[methane]

This module has both of logger and _logger.

[methane]

This function should use protobuf json serializer.

from opentelemetry.exporter.otlp.proto.common.trace_encoder import (
    encode_spans,
)
from google.protobuf import json_format

message = encode_spans(sdk_spans)
return json_format.MessageToJson(message, indent=None)

[methane]

exporter-otlp-json can be just copy of exporter-otlp-proto-http and just replace these lines:

opentelemetry-python/exporter/opentelemetry-exporter-otlp-proto-http/src/opentelemetry/exporter/otlp/proto/http/trace_exporter/__init__.py

Line 136 in 2b9dcfc

serialized_data = encode_spans(spans).SerializeToString()

opentelemetry-python/exporter/opentelemetry-exporter-otlp-proto-http/src/opentelemetry/exporter/otlp/proto/http/metric_exporter/__init__.py

Line 181 in 2b9dcfc

resp = self._export(serialized_data.SerializeToString())

opentelemetry-python/exporter/opentelemetry-exporter-otlp-proto-http/src/opentelemetry/exporter/otlp/proto/http/_log_exporter/__init__.py

Line 138 in 2b9dcfc

serialized_data = encode_logs(batch).SerializeToString()

into json_format.MessageToJson(encode_xxx(...), indent=None).

[methane]

Or can we just add json option to otlp-proto-http exporter? They are very close.
How other languages implement them?