Move assert to a dedicated header #2418

Job	Run time
Linux [UBSAN] [lmdb \| clang]	17m 9s
Linux [ASAN] [lmdb \| clang]	14m 21s
macOS [UBSAN] [lmdb \| clang]	38m 51s
macOS [ASAN] [lmdb \| clang]	30m 39s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	14m 7s
Linux [TSAN] [lmdb \| clang]	14m 10s
macOS [TSAN] [lmdb \| clang]	32m 8s
Linux [LEAK] [lmdb \| clang]	14m 4s
macOS [UBSAN] [rocksdb \| clang]	41m 26s
macOS [ASAN] [rocksdb \| clang]	38m 0s
Linux [UBSAN] [rocksdb \| clang]	15m 0s
macOS [TSAN] [rocksdb \| clang]	57m 8s
Linux [ASAN] [rocksdb \| clang]	14m 37s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	14m 21s
Linux [LEAK] [rocksdb \| clang]	14m 24s
	6h 10m 25s

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