MRG: add utilities for using ictv taxonomic ranks with `sourmash tax` #4486

Job	Run time
Check	27s
coverage	9m 19s
Lints (beta)	31s
test (beta)	1m 23s
Lints (stable)	28s
test (stable)	1m 25s
test_all_features	10m 9s
test (windows)	3m 24s
Run tests under wasm32-wasi	1m 19s
test (macos)	3m 30s
Check if wasm-pack builds a valid package for the sourmash crate	1m 16s
Check if cbindgen runs cleanly for generating the C headers	55s
minimum_rust_version	9m 14s
Publish (dry-run)	5m 46s
	49m 6s

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