refactor: adapt ProtocolHandler impl #100

Job	Run time
Android Build Only (aarch64-linux-android)	1m 11s
check_semver	1m 36s
Android Build Only (armv7-linux-androideabi)	1m 10s
Cross Build Only (x86_64-unknown-freebsd)	45s
Checking docs	1m 10s
Checking fmt	20s
clippy_check	1m 50s
Cross Test (i686-unknown-linux-gnu)	1m 1s
cargo deny	33s
codespell	8s
Minimal Supported Rust Version	1m 30s
CI Test Suite / Tests (ubuntu-latest, stable, all)	1m 34s
CI Test Suite / Tests (ubuntu-latest, stable, none)	1m 3s
CI Test Suite / Tests (ubuntu-latest, stable, default)	1m 10s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	2m 15s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	1m 43s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	1m 38s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	1m 8s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	1m 49s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	1m 18s
	24m 52s

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