[issue18643] implement socketpair() on Windows

[Charles-François Natali]

Charles-François Natali added the comment:

Alright, I chose a 16MB size for SOCK_MAX_SIZE because nowadays, one
can encounter large buffers for Gigabit/10Gb Ethernet.

Regarding the original issue: is it OK to add it as
socket.socketpair(), or should it only be added to test.support?
Since I don't use Windows, I don't know if this deserves being expose
in socket module, but having socketpair() available in the test suite
would be really useful (for example, most select tests aren't run on
Windows because they use pipes).

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