Move socket_functions impl #2397

Job	Run time
Linux [UBSAN] [lmdb \| clang]	40m 11s
macOS [UBSAN] [lmdb \| clang]	34m 3s
Linux [ASAN] [lmdb \| clang]	36m 21s
macOS [ASAN] [lmdb \| clang]	24m 39s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	41m 35s
macOS [TSAN] [lmdb \| clang]	25m 39s
macOS [UBSAN] [rocksdb \| clang]	41m 55s
Linux [TSAN] [lmdb \| clang]	38m 32s
macOS [ASAN] [rocksdb \| clang]	39m 31s
Linux [LEAK] [lmdb \| clang]	36m 39s
macOS [TSAN] [rocksdb \| clang]	45m 55s
Linux [UBSAN] [rocksdb \| clang]	48m 16s
Linux [ASAN] [rocksdb \| clang]	55m 50s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	53m 3s
Linux [LEAK] [rocksdb \| clang]	51m 58s
	10h 14m 7s

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