A spec-compliance WebSocket implementation

[anonymous-12138]

Re: #

Changelog

• Remove existing WebSocket polyfills in platform/ since:
  • it's not align with spec,
  • it can't send ArrayBufferViews on wechat
• Add a more spec-compliance WebSocket implementation in source
• Add an engine feature called "WebSocket Exports" which exports WebSocket, CloseEvent, MessageEvent
• Add an engine feature called "WebSocket shim" which polyfill the above symbols onto global.

I didn't test these on misc platforms but web/wechat.

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Continuous Integration

This pull request:

• needs automatic test cases check.

  Manual trigger with @cocos-robot run test cases afterward.

• does not change any runtime related code or build configuration

  If any reviewer thinks the CI checks are needed, please uncheck this option, then close and reopen the issue.

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Compatibility Check

This pull request:

• changes public API, and have ensured backward compatibility with deprecated features.
• affects platform compatibility, e.g. system version, browser version, platform sdk version, platform toolchain, language version, hardware compatibility etc.
• affects file structure of the build package or build configuration which requires user project upgrade.
• introduces breaking changes, please list all changes, affected features and the scope of violation.