MRG: add skipmer capacity to sourmash python layer via ffi #6171

Job	Run time
Check	30s
test (beta)	1m 31s
test (stable)	1m 26s
test (windows)	4m 39s
test_all_features	12m 27s
test (macos)	1m 18s
coverage	9m 11s
Check if cbindgen runs cleanly for generating the C headers	7m 58s
Lints (beta)	39s
minimum_rust_version	6m 32s
Publish (on tags, dry-run otherwise)	5m 51s
Lints (stable)	27s
Run tests under wasm32-wasi	1m 13s
Check if wasm-pack builds a valid package for the sourmash crate	1m 24s
	55m 6s

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