Merge pull request #143 from wingo/filesystem-mkdir-rmdir #699

Job	Run time
Build Assemblyscript tests (windows-latest)	34s
Build Assemblyscript tests (ubuntu-latest)	22s
Build C tests (ubuntu-latest)	9s
Build Rust tests (macos-latest)	1m 29s
Build Rust tests (ubuntu-latest)	48s
Build C tests (macos-latest)	19s
Build Assemblyscript tests (macos-latest)	25s
Build Assemblyscript tests (windows-11-arm)	25s
Build C tests (windows-latest)	29s
Build C tests (windows-11-arm)	18s
Build Rust tests (windows-latest)	58s
Build Rust tests (windows-11-arm)	1m 1s
upload_test_binaries	0s
Run tests	0s
	7m 17s

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