MRG: add skipmer capacity to sourmash python layer via ffi #6170

Job	Run time
Check	26s
test (beta)	1m 30s
test (stable)	1m 21s
test (windows)	3m 56s
test (macos)	1m 19s
coverage	8m 47s
Lints (beta)	12s
test_all_features	12m 44s
Lints (stable)	6s
Check if wasm-pack builds a valid package for the sourmash crate	1m 26s
Publish (on tags, dry-run otherwise)	5m 27s
Run tests under wasm32-wasi	1m 11s
Check if cbindgen runs cleanly for generating the C headers	7m 59s
minimum_rust_version	6m 31s
	52m 55s

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