feat: unlink op, remove_file and remove_dir (#288) #661

Job	Run time
test (x86_64-unknown-linux-gnu, stable)	4m 44s
test (x86_64-unknown-linux-gnu, nightly)	4m 47s
test (aarch64-unknown-linux-gnu, stable)	2m 16s
test (aarch64-unknown-linux-gnu, nightly)	2m 18s
test (armv7-unknown-linux-gnueabihf, stable)	2m 22s
test (armv7-unknown-linux-gnueabihf, nightly)	4m 28s
test (riscv64gc-unknown-linux-gnu, stable)	4m 24s
test (riscv64gc-unknown-linux-gnu, nightly)	2m 23s
test (s390x-unknown-linux-gnu, stable)	2m 12s
test (s390x-unknown-linux-gnu, nightly)	2m 20s
test (x86_64-apple-darwin, stable)	4m 7s
test (x86_64-apple-darwin, nightly)	4m 8s
test (aarch64-apple-darwin, stable)	3m 20s
test (aarch64-apple-darwin, nightly)	3m 27s
test (x86_64-pc-windows-gnu, stable)	3m 43s
test (x86_64-pc-windows-gnu, nightly)	5m 24s
test (x86_64-pc-windows-msvc, stable)	6m 48s
test (x86_64-pc-windows-msvc, nightly)	6m 3s
test (i686-pc-windows-gnu, stable)	8m 20s
test (i686-pc-windows-gnu, nightly)	8m 17s
test (i686-pc-windows-msvc, stable)	5m 52s
test (i686-pc-windows-msvc, nightly)	3m 46s
	1h 35m 29s

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