[libc] [llvm] [libc][bazel] Add remaining sys/socket functions and tests (PR #209798)

[Michael Jones via llvm-commits]

https://github.com/michaelrj-google approved this pull request.

LGTM, `TestDirectoryScope` seems like a useful tool. In a future PR we might want to move it somewhere we can use it more widely.

https://github.com/llvm/llvm-project/pull/209798