wasi:[email protected]: Add tests for mkdir/rmdir #481

Job	Run time
Build Assemblyscript tests (windows-latest)	25s
Build Rust tests (ubuntu-latest)	55s
Build Assemblyscript tests (ubuntu-latest)	26s
Build Assemblyscript tests (windows-11-arm)	54s
Build Assemblyscript tests (macos-latest)	18s
Build C tests (windows-latest)	38s
Build Rust tests (windows-latest)	1m 3s
Build C tests (windows-11-arm)	1m 2s
Build Rust tests (macos-latest)	1m 19s
Build C tests (macos-latest)	12s
Build Rust tests (windows-11-arm)	1m 13s
Build C tests (ubuntu-latest)	12s
Run tests (windows-latest, wasmtime)	56s
Run tests (ubuntu-latest, wasmtime)	28s
Run tests (windows-11-arm, wasmtime)	1m 18s
Run tests (macos-latest, wasmtime)	22s
upload_test_binaries	0s
	11m 41s

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