feat: add support for async database #4361

Job	Run time
docs	1m 0s
check	22s
check no_std	33s
check serde	27s
clippy	1m 20s
check no_std kzg-rs	33s
fmt	8s
check std	24s
TyposCheck	7s
test stable --no-default-features	1m 7s
test stable	1m 16s
test stable --all-features	1m 18s
test beta --no-default-features	1m 7s
test beta	59s
test beta --all-features	1m 13s
test nightly --no-default-features	1m 54s
test nightly	1m 51s
test nightly --all-features	1m 58s
	17m 37s

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