refactor: Lightweight watcher #422

Job	Run time
Cross Build Only (x86_64-unknown-freebsd)	51s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	1m 59s
Android Build Only (aarch64-linux-android)	1m 10s
CI Test Suite / Tests (ubuntu-latest, stable, none)	1m 32s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	2m 1s
Android Build Only (armv7-linux-androideabi)	1m 11s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	2m 2s
check_semver	1m 41s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	1m 40s
Cross Test (i686-unknown-linux-gnu)	1m 37s
CI Test Suite / Tests (ubuntu-latest, stable, default)	1m 24s
CI Test Suite / Tests (ubuntu-latest, stable, all)	1m 25s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	1m 35s
cargo deny	29s
codespell	4s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	1m 34s
Minimal Supported Rust Version	1m 14s
clippy_check	1m 45s
Checking docs	1m 5s
Checking fmt	22s
	26m 41s

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