feat: Add a pipe-based notifier to epoll #666

Job	Run time
msrv (ubuntu-latest, 1.63)	1m 5s
msrv (windows-latest, 1.63)	1m 21s
test (ubuntu-latest, nightly)	1m 39s
test (ubuntu-latest, beta)	1m 17s
test (ubuntu-latest, stable)	55s
test (windows-latest, nightly)	2m 7s
test (windows-latest, beta)	3m 39s
test (windows-latest, stable)	2m 36s
test (macos-latest, nightly)	59s
test (macos-latest, beta)	48s
test (macos-latest, stable)	53s
test (windows-latest, nightly-x86_64-pc-windows-gnu)	1m 25s
test (windows-latest, nightly-i686-pc-windows-msvc)	1m 40s
test (windows-latest, nightly-i686-pc-windows-gnu)	1m 53s
clippy	13s
cross (ubuntu-latest)	1m 57s
cross (macos-latest)	41s
fmt	6s
security_audit	1m 54s
wine	1m 24s
	28m 32s

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