Support multiple package in a single WIT source #3977

Job	Run time
Fuzz	2m 19s
doc	1m 34s
Build wasm-tools (x86_64-linux, ubuntu-latest)	2m 47s
check	2m 2s
Build wasm-tools (x86_64-macos, macos-latest, x86_64-apple-darwin)	2m 4s
Rustfmt	18s
Build wasm-tools (aarch64-macos, macos-latest, aarch64-apple-darwin)	2m 7s
Test (ubuntu-latest, default)	2m 33s
Build wasm-tools (x86_64-windows, windows-latest)	4m 39s
Test (ubuntu-latest, beta)	2m 30s
Test the C API (ubuntu-latest)	55s
Build wasm-tools (aarch64-linux, ubuntu-latest, aarch64-unknown-linux-gnu)	3m 1s
Test with extra Cargo features	2m 7s
Test (ubuntu-latest, nightly)	2m 12s
Test the C API (macos-latest)	1m 3s
Build wasm-tools (wasm32-wasi, ubuntu-latest, wasm32-wasi)	1m 48s
Test (macos-latest, default)	2m 0s
Test the C API (windows-latest)	2m 48s
Test (windows-latest, default)	4m 12s
Test libdl.so	1m 0s
Test (ubuntu-latest, msrv)	2m 37s
Test (no-hash-maps)	2m 35s
verify-publish	1m 59s
Test on WebAssembly	3m 16s
Record the result of testing and building steps	1s
	54m 27s

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