add(scan): Implement `RegisterKeys` service request to register new keys #791

Job	Run time
Test stable on ubuntu-latest	30m 5s
Install zebrad from lockfile without cache on ubuntu-latest	8m 59s
Test beta on ubuntu-latest	30m 18s
Check Cargo.lock is up to date	1m 3s
Test stable on macos-latest	40m 45s
Check deny.toml bans	31s
Check for unused dependencies	14s
Check deny.toml bans --features default-release-binaries	28s
Check deny.toml bans --all-features	26s
Check deny.toml sources	29s
Check deny.toml sources --features default-release-binaries	25s
Check deny.toml sources --all-features	25s
Open or update issues for OS integration failures	0s
	1h 54m 8s

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