feat(fs/unstable): add readDir #16234

Job	Run time
test-node (latest, ubuntu-latest)	13s
lint (ubuntu-latest)	25s
lint (windows-latest)	40s
test (v1.x, ubuntu-latest)	1m 15s
wasm (crypto/_wasm)	6s
test (v1.x, windows-latest)	2m 19s
test (v1.x, macOS-latest)	1m 36s
test (v2.x, ubuntu-latest)	2m 18s
test (v2.x, windows-latest)	2m 37s
test (v2.x, macOS-latest)	2m 17s
test (canary, ubuntu-latest)	2m 47s
test (canary, windows-latest)	2m 41s
test (canary, macOS-latest)	2m 37s
	21m 51s

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