WIP: skipmer improvements #6083

Job	Run time
Check	30s
test (beta)	1m 27s
test (stable)	1m 24s
test (windows)	3m 59s
coverage	10m 6s
Lints (beta)	35s
test (macos)	1m 38s
Lints (stable)	30s
test_all_features	13m 26s
Check if wasm-pack builds a valid package for the sourmash crate	1m 24s
Check if cbindgen runs cleanly for generating the C headers	9m 1s
minimum_rust_version	7m 22s
Publish (on tags, dry-run otherwise)	6m 41s
Run tests under wasm32-wasi	1m 14s
	59m 17s

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