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

Beginne beim Einstiegspunkt sock_connect in asyncio und verfolge dessen getaddrinfo-Aufruf, um zu verstehen, wie das Socket-Protokoll derzeit ausgewählt wird. Prüfe den verknüpften PR gh-123175 und die bestehenden asyncio-Netzwerktests; abgeschlossen ist die Aufgabe, wenn das optionale Verhalten proto_addr_info abgedeckt ist, ohne das Standardverhalten zu ändern.