WIP: skipmer improvements #6082

Job	Run time
Check	29s
coverage	10m 9s
Lints (beta)	36s
Lints (stable)	27s
Publish (on tags, dry-run otherwise)	6m 44s
test (beta)	1m 29s
test_all_features	13m 35s
Run tests under wasm32-wasi	1m 18s
test (stable)	1m 21s
test (windows)	4m 41s
test (macos)	1m 37s
Check if wasm-pack builds a valid package for the sourmash crate	1m 29s
Check if cbindgen runs cleanly for generating the C headers	8m 47s
minimum_rust_version	7m 21s
	1h 0m 3s

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