add `is_path_ignored` API #2315

Job	Run time
docs	37s
test (pinned, ubuntu-latest, 1.72.1)	1m 47s
rustfmt	14s
test (stable, ubuntu-latest, stable)	1m 47s
test (beta, ubuntu-latest, beta)	2m 18s
test (nightly, ubuntu-latest, nightly)	2m 2s
test (stable-musl, ubuntu-latest, stable, x86_64-unknown-linux-musl)	3m 13s
test (stable-x86, ubuntu-latest, stable, i686-unknown-linux-gnu)	2m 19s
test (stable-aarch64, ubuntu-latest, stable, aarch64-unknown-linux-gnu)	6m 49s
test (stable-powerpc64, ubuntu-latest, stable, powerpc64-unknown-linux-gnu)	5m 2s
test (stable-s390x, ubuntu-latest, stable, s390x-unknown-linux-gnu)	4m 57s
test (macos, macos-latest, nightly)	1m 46s
test (win-msvc, windows-2022, nightly)	3m 13s
test (win-gnu, windows-2022, nightly-x86_64-gnu)	4m 20s
	40m 24s

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