feat: Safari Web Extension

[vad1ym]

Description

I don't have enough experience in contributing and pull-requests, so I would be thankful for help.

It adds possibility to build Safari Web Extension that works similar to Chrome extension #1139
Tested with Safari Technology Preview (Safari 16.0) on Mac OS 12.4.
Builded with Xcode 14 beta 3

Safari 16 and Xcode 14 allow us to write extension with a Web Inspector tab feature.
Added shell-safari folder based on shell-chrome folder, just replaced chrome.* with browser.* in some code lines.
Added shell-safari/app folder with Xcode Safari Web Extension Folder.
Added some scripts to package.json for building the extension app

How to build extension

1. yarn build
2. cd packages/shell-safari
3. yarn safari
   Builded extension app: packages/shell-safari/app/extension/VueDevTools.app

P.S. To see extension from Safari preferences you should activate Develop/Allow Unsigned Extensions. To avoid this, the extension must be signed with Apple Developer Account.

Additional context

I guess, it should use same code base for Chrome and Safari (with chrome.* and browser.* difference), but I think it should be done by main developers of this repository.

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the Commit Convention.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).

[Akryum]

We should try to reuse the chrome folder instead of duplicating code I guess

[50rayn]

Are there any news?