[libc] Add socket test support library (#193207) A couple of tests (and I plan to add a couple more) need to create/compare unix domain socket addresses. This isn't completely trivial due to the the interaction between the `addrlen` argument and the terminating '\0', and the existing code doing that was subtly wrong in some cases. This patch centralizes the functions for these operations, reducing code duplication and ensuring consistent (and correct) behavior everywhere.
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