feat(fs/unstable): add chmod and chmodSync #16255

Job	Run time
test-node (latest, ubuntu-latest)	12s
lint (ubuntu-latest)	6s
test (v1.x, ubuntu-latest)	1m 20s
lint (windows-latest)	20s
test (v1.x, windows-latest)	1m 48s
wasm (crypto/_wasm)	3s
test (v1.x, macOS-latest)	1m 26s
test (v2.x, ubuntu-latest)	2m 11s
test (v2.x, windows-latest)	2m 27s
test (v2.x, macOS-latest)	2m 13s
test (canary, ubuntu-latest)	2m 18s
test (canary, windows-latest)	2m 34s
test (canary, macOS-latest)	2m 41s
	19m 39s

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