WIP: skipmer improvements #6047

Job	Run time
Check	28s
coverage	31m 51s
Lints (beta)	37s
Lints (stable)	36s
test (beta)	1m 59s
test_all_features	5m 3s
Check if wasm-pack builds a valid package for the sourmash crate	1m 22s
test (stable)	2m 30s
test (windows)	6m 6s
test (macos)	2m 45s
Check if cbindgen runs cleanly for generating the C headers	8m 31s
minimum_rust_version	6m 54s
Publish (on tags, dry-run otherwise)	8m 51s
Run tests under wasm32-wasi	1m 16s
	1h 18m 49s

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