[Feature]: support registering new connections to event-loops

[coderczp]

Description of new feature

需求: 在代理场景下支持server和client复用eventloop

Scenarios for new feature

需求: 在代理场景下支持server和client复用eventloop
描述：
在代理场景中，server和client任意一端的Read数据都需要换醒对方进行write，由于server和client是独立的event loop，因此必然会存在goroutine的切换，如果client复用server的event loop,那么能带来两个好处：1 避免goroutine切换 2 避免buffer的copy

Breaking changes or not?

Yes

Code snippets (optional)

Alternatives for new feature

None.

Additional context (optional)

None.

[panjf2000]

一个 issue 一个 feature request，请把这个 issue 拆成两个。

[gh-translator]

🤖 Non-English text detected, translating ...

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One issue and one feature request, please split this issue into two.

[coderczp]

一个 issue 一个 feature request，请把这个 issue 拆成两个。

done. #690

[gh-translator]

🤖 Non-English text detected, translating ...

---

One issue and one feature request, please split this issue into two.

done. #690

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