feat(storage): add mmap file utility #6381

Job	Run time
test (macos-latest)	4m 19s
executable-run (macos-latest)	4m 2s
test (ubuntu-latest)	6m 54s
build-load-test (macos-latest)	5m 19s
commitlint	17s
executable-run (ubuntu-latest)	3m 29s
build-load-test (ubuntu-latest)	59s
integration-test (macos-latest)	13m 24s
integration-test (ubuntu-latest)	3m 42s
rustfmt	24s
udeps	4m 57s
check	42s
check-starknet_api-dependency	7s
clippy	50s
doc	49s
codecov	30m 50s
	1h 21m 4s

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