fix(rpc): Refactor `getrawtransaction` & RPC error handling #1490

Job	Run time
Generate crates matrix	14s
Check crates matrix	1s
Build tower-batch-control crate	12s
Build tower-fallback crate	1s
Build zebra-chain crate	1s
Build zebra-consensus crate	1s
Build zebra-grpc crate	1s
Build zebra-network crate	1s
Build zebra-node-services crate	1s
Build zebra-rpc crate	1s
Build zebra-scan crate	1s
Build zebra-script crate	1s
Build zebra-state crate	1s
Build zebra-test crate	1s
Build zebra-utils crate	1s
Build zebrad crate	1s
	40s

Provide feedback