refactor: remove finch conversion, support zstd and lzma in wasm #6343

Job	Run time
Check	30s
test (beta)	47s
test (stable)	42s
test (windows)	2m 55s
test (macos)	1m 17s
coverage	1m 41s
Lints (beta)	26s
minimum_rust_version	1m 0s
Lints (stable)	28s
Publish (on tags, dry-run otherwise)	13m 46s
test_all_features	2m 24s
Check if wasm-pack builds a valid package for the sourmash crate	52s
Check if cbindgen runs cleanly for generating the C headers	44s
	27m 32s

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