fix(rpc): Refactor `getrawtransaction` & RPC error handling #2304

Job	Run time
Check deny.toml bans	45s
Check Cargo.lock is up to date	1m 9s
Check deny.toml bans --features default-release-binaries	42s
Check deny.toml bans --all-features	50s
Check deny.toml sources	44s
Install zebrad from lockfile without cache on ubuntu-latest	8m 41s
Check deny.toml sources --features default-release-binaries	42s
Check deny.toml sources --all-features	42s
Test stable on ubuntu-latest	29m 35s
Check for unused dependencies	8s
Test beta on ubuntu-latest	29m 23s
Test stable on macos-latest	36m 41s
Test stable on windows-latest	1h 1m 13s
Test beta on windows-latest	1h 1m 22s
Open or update issues for OS integration failures	0s
	3h 52m 37s

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