feat: RocksDB storage and self-contained RevIndex with internal storage #5379

Job	Run time
coverage	9m 44s
test (beta)	1m 37s
Check	26s
test (stable)	1m 37s
Check if cbindgen runs cleanly for generating the C headers	8m 14s
test (windows)	4m 22s
test (macos)	1m 19s
Lints (beta)	16s
minimum_rust_version	8m 0s
Lints (stable)	5s
Publish (dry-run)	5m 53s
test_all_features	13m 40s
Run tests under wasm32-wasi	1m 22s
Check if wasm-pack builds a valid package for the sourmash crate	1m 59s
	58m 34s

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