Add `contains_file_named` #556

Job	Run time
fuzz_read_with_no_features	3h 5m 4s
fuzz_write	3h 11m 37s
fuzz_write_with_no_features	27m 22s
Build and test: ubuntu-latest, stable	38s
Build and test: ubuntu-latest, nightly	48s
Build and test: ubuntu-latest, msrv	54s
Build and test: macOS-latest, stable	3m 37s
Build and test: macOS-latest, nightly	2m 45s
Build and test: macOS-latest, msrv	1m 39s
Build and test: windows-latest, stable	1m 49s
Build and test: windows-latest, nightly	1m 49s
Build and test: windows-latest, msrv	1m 44s
fuzz_read	3h 38m 25s
Checking fmt and docs	15s
clippy	27s
	10h 38m 53s

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