refactor: Lightweight watcher #359

Job	Run time
Cross Build Only (x86_64-unknown-freebsd)	50s
Android Build Only (aarch64-linux-android)	1m 10s
Android Build Only (armv7-linux-androideabi)	1m 11s
Checking fmt	40s
Minimal Supported Rust Version	1m 17s
check_semver	1m 10s
Cross Test (i686-unknown-linux-gnu)	1m 18s
Checking docs	55s
clippy_check	1m 26s
codespell	7s
cargo deny	30s
CI Test Suite / Tests (ubuntu-latest, stable, all)	1m 42s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	1m 59s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	1m 37s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	1m 38s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	2m 5s
CI Test Suite / Tests (ubuntu-latest, stable, default)	1m 33s
CI Test Suite / Tests (ubuntu-latest, stable, none)	1m 24s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	1m 59s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	1m 37s
	26m 8s

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