Move network_constants to a dedicated header #2492

Job	Run time
Linux [UBSAN] [lmdb \| clang]	40m 21s
Linux [ASAN] [lmdb \| clang]	39m 59s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	40m 49s
Linux [TSAN] [lmdb \| clang]	38m 38s
macOS [UBSAN] [lmdb \| clang]	34m 11s
Linux [LEAK] [lmdb \| clang]	38m 7s
macOS [ASAN] [lmdb \| clang]	28m 22s
macOS [TSAN] [lmdb \| clang]	30m 51s
Linux [UBSAN] [rocksdb \| clang]	47m 19s
macOS [UBSAN] [rocksdb \| clang]	40m 15s
Linux [ASAN] [rocksdb \| clang]	54m 24s
macOS [ASAN] [rocksdb \| clang]	37m 13s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	54m 14s
macOS [TSAN] [rocksdb \| clang]	50m 36s
Linux [LEAK] [rocksdb \| clang]	54m 7s
	10h 29m 26s

Provide feedback