refactor: adapt ProtocolHandler impl #101

Job	Run time
cargo deny	33s
Checking docs	1m 31s
Android Build Only (aarch64-linux-android)	1m 11s
Checking fmt	28s
Android Build Only (armv7-linux-androideabi)	1m 10s
check_semver	1m 15s
clippy_check	1m 12s
codespell	6s
Cross Build Only (x86_64-unknown-freebsd)	44s
Cross Test (i686-unknown-linux-gnu)	1m 1s
Minimal Supported Rust Version	1m 25s
CI Test Suite / Tests (ubuntu-latest, stable, all)	1m 34s
CI Test Suite / Tests (ubuntu-latest, stable, none)	49s
CI Test Suite / Tests (ubuntu-latest, stable, default)	54s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	1m 23s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	54s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	1m 59s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	1m 0s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	1m 16s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	1m 28s
	21m 53s

Provide feedback