refactor: remove finch conversion, support zstd and lzma in wasm #6342

Job	Run time
coverage	8m 24s
Check	23s
Lints (beta)	25s
Lints (stable)	34s
minimum_rust_version	6m 6s
Publish (on tags, dry-run otherwise)	13m 9s
test (beta)	1m 46s
test_all_features	9m 5s
test (stable)	1m 51s
Check if wasm-pack builds a valid package for the sourmash crate	1m 45s
test (windows)	3m 53s
test (macos)	1m 7s
Check if cbindgen runs cleanly for generating the C headers	5m 41s
	54m 9s

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