Add an `proto_addr_info` argument to sock_connect in asyncio

Feature or enhancement

Proposal:

Allow the selection of the protocol used by getaddrinfo by adding an additional, optional parameter proto_addr_info which defaults to None.

If not specified, use the protocol used by the socket ( = previous behaviour).

This change is needed to allow custom protocols to be used with the sock_connect, because these protocols may raise an error when calling getaddrinfo (result in a ai_proto not supported error). An example of such protocol is MPTCP (https://mptcp.dev)

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response

Linked PRs

• gh-123175

从 asyncio 的 sock_connect 入口点开始，跟踪其 getaddrinfo 调用，以了解当前如何选择 socket 协议。查看关联的 PR gh-123175 和现有的 asyncio 网络测试；完成的标准是覆盖可选的 proto_addr_info 行为，同时不改变默认行为。