feat!: simplify LocalPool handling #178

Job	Run time
Android Build Only (aarch64-linux-android)	1m 3s
Android Build Only (armv7-linux-androideabi)	1m 2s
Checking fmt	21s
check_semver	1m 14s
Cross Build Only (x86_64-unknown-freebsd)	38s
Cross Test (i686-unknown-linux-gnu)	46s
cargo deny	27s
Checking docs	49s
clippy_check	1m 46s
codespell	5s
Minimal Supported Rust Version	51s
CI Test Suite / Tests (ubuntu-latest, stable, all)	1m 19s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	1m 54s
CI Test Suite / Tests (ubuntu-latest, stable, none)	48s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	1m 13s
CI Test Suite / Tests (ubuntu-latest, stable, default)	26s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	1m 9s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	1m 30s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	48s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	29s
	18m 38s

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