Support Pool and Proxy identity

[leoc11]

FEATURE

• Comlink.opch for optional chaining Remote object
• Comlink.pool. Comlink.wrap with thread pool (close: Worker Pool for similar tasks #657)
• Comlink.unexpose to release exposed object (close: How to releaseProxy from the expose() side? #674)
• support Symbol.iterator and Symbol.asyncIterator on exposed side. wrap as Symbol.asyncIterator in proxy.
• add ReadyMessage. wait for exposed side to ready before sending any message. (close: Exposed function deadlocks if called too early #665, Web Worker Hangs if Imported File Contains Top-Level Await #635)
• add HeartBeat (close: Finalizer not invoked automatically with sharedworkers #673)
• Always use the same endpoint for communication between thread.
• Always create direct communication line between thread, avoid transit. (avoid re-proxy proxy)
• Remote object are transferred by default. no need to wrap with Comlink.proxy()
• Comlink.Proxy no longer polute object
• Proxy tracker.
  • When proxy object return to source thread, it will serialize to real object.
  • Same proxy will be deserialize for the same Comlink.ProxyMarked on exposed side.
• Improve typing.
  • close TypeScript typings seem off when wrapping an object graph #680
  • support function overloading

BREAKING CHANGES

• Comlink.createEndPoint removed.
• Comlink.proxyRelease removed. use Symbol.asyncDispose instead
• Comlink.finalizer removed. use Symbol.dispose or Symbol.asyncDispose instead
• typing: Comlink.warp only accept Comlink.ProxyMarked type returned by Comlink.expose
• Function are proxied by default. no need to wrap with Comlink.proxy()
• Original value provided in Comlink.proxy() won't be automatically proxied anymore. Only return value from Comlink.proxy() will be proxied.

PERFORMANCE

• use incremental number instead of UUID for MessageID.
• use the same Proxy Target for all proxy.

NOTE: published package with this PR, @leoc11/comlink

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