feat: add rpc protocol, client and server #27

Job	Run time
Cross Build Only (x86_64-unknown-freebsd)	44s
Android Build Only (aarch64-linux-android)	1m 8s
cargo deny	35s
Android Build Only (armv7-linux-androideabi)	1m 7s
Checking docs	1m 29s
check_semver	1m 38s
Checking fmt	30s
clippy_check	2m 8s
codespell	4s
Cross Test (i686-unknown-linux-gnu)	30m 14s
Minimal Supported Rust Version	1m 11s
CI Test Suite / Tests (ubuntu-latest, stable, all)	1m 15s
CI Test Suite / Tests (ubuntu-latest, stable, none)	42s
CI Test Suite / Tests (ubuntu-latest, stable, default)	1m 15s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	1m 42s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	1m 8s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	1m 12s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	1m 40s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	58s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	1m 4s
	51m 44s

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