implement `getsockname`, `getpeername`, and `getaddrinfo` #49

Job	Run time
Rustfmt	15s
wasi-headers test	0s
Build libc (ubuntu-latest, 10.0.0)	1m 23s
Build libc (macos-latest, 10.0.0)	1m 45s
Build libc (windows-latest, 10.0.0)	1m 35s
Build libc (ubuntu-latest, 16.0.0, x86_64-linux-gnu-ubuntu-18.04)	1m 49s
Build libc (macos-latest, 15.0.7, x86_64-apple-darwin21.0)	1m 24s
Build libc (windows-latest, 16.0.0)	1m 34s
	9m 45s

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