Add helper functions for configuration file loading #381

Job	Run time
Linux [UBSAN] [lmdb \| clang]	27m 48s
Linux [ASAN] [lmdb \| clang] (Errors Ignored)	24m 25s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	24m 28s
Linux [TSAN] [lmdb \| clang] (Errors Ignored)	27m 3s
Linux [UBSAN] [rocksdb \| clang]	27m 24s
Linux [ASAN] [rocksdb \| clang] (Errors Ignored)	24m 41s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	27m 9s
Linux [TSAN] [rocksdb \| clang] (Errors Ignored)	25m 24s
	3h 28m 22s

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