fix(rpc): Refactor the serialization of note commitment trees #1362

Job	Run time
Check deny.toml bans	37s
Check Cargo.lock is up to date	1m 29s
Check deny.toml bans --features default-release-binaries	30s
Install zebrad from lockfile without cache on ubuntu-latest	9m 8s
Check deny.toml bans --all-features	31s
Check deny.toml sources	31s
Test stable on ubuntu-latest	30m 41s
Check deny.toml sources --features default-release-binaries	30s
Check for unused dependencies	9s
Test beta on ubuntu-latest	30m 28s
Check deny.toml sources --all-features	32s
Test stable on macos-latest	1h 0m 15s
Test stable on windows-latest	1h 0m 36s
Test beta on windows-latest	59m 23s
Open or update issues for OS integration failures	0s
	4h 15m 20s

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