feat: add support for `subdir` #654

Job	Run time
build-doc	2m 14s
cargo audit	43s
wit-deps-aarch64-unknown-linux-musl	2m 14s
cargo fmt	46s
wit-deps-aarch64-apple-darwin	2m 15s
cargo clippy	2m 14s
wit-deps-armv7-unknown-linux-musleabihf	2m 12s
cargo nextest	2m 15s
wit-deps-x86_64-apple-darwin	2m 15s
wit-deps-x86_64-pc-windows-gnu	2m 15s
wit-deps-x86_64-unknown-linux-musl	2m 15s
deploy-doc	1s
wit-deps-universal-darwin	1s
oci	1s
release	1s
	21m 42s

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