change(rpc): Update `getblock` RPC to more closely match zcashd #2234

Job	Run time
Test stable on ubuntu-latest	41m 14s
Test beta on ubuntu-latest	31m 23s
Test stable on macos-latest	48m 27s
Test stable on windows-latest	1h 0m 12s
Test beta on windows-latest	1h 0m 59s
Check deny.toml bans	47s
Check deny.toml bans --features default-release-binaries	52s
Check Cargo.lock is up to date	8m 31s
Install zebrad from lockfile without cache on ubuntu-latest	8m 37s
Check deny.toml bans --all-features	1m 9s
Check for unused dependencies	16s
Check deny.toml sources	44s
Check deny.toml sources --features default-release-binaries	43s
Check deny.toml sources --all-features	43s
Open or update issues for OS integration failures	0s
	4h 24m 37s

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