WIP: skipmer improvements #6032

Job	Run time
Check	26s
test (beta)	28m 37s
test_all_features	6m 22s
test (stable)	41m 6s
test (windows)	5m 44s
test (macos)	54m 19s
coverage	49m 50s
Lints (beta)	14s
Lints (stable)	8s
minimum_rust_version	7m 8s
Publish (on tags, dry-run otherwise)	6m 13s
Run tests under wasm32-wasi	1m 16s
Check if wasm-pack builds a valid package for the sourmash crate	1m 30s
Check if cbindgen runs cleanly for generating the C headers	8m 43s
	3h 31m 36s

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