pidwait: Use common process_matcher (+ move a pidwait feature there) #1274

Job	Run time
cargo fmt --all -- --check	8s
cargo test (ubuntu-latest)	34s
Code Coverage (ubuntu-latest, unix)	1m 49s
cargo check (ubuntu-latest)	17s
cargo test (macOS-latest)	41s
Code Coverage (macos-latest, macos)	1m 41s
cargo check (macOS-latest)	27s
cargo test (windows-latest)	2m 30s
Code Coverage (windows-latest, windows)	4m 51s
cargo check (windows-latest)	2m 34s
	15m 32s

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