feat(rpc): Add more fields to `getmininginfo` call #1841

Job	Run time
Generate crates matrix	23s
Check crates matrix	3s
Build zebrad crate	39m 10s
Build zebra-utils crate	16m 38s
Build zebra-test crate	1m 37s
Build zebra-state crate	22m 46s
Build zebra-script crate	3m 40s
Build zebra-scan crate	27m 30s
Build zebra-rpc crate	34m 36s
Build zebra-node-services crate	3m 39s
Build zebra-network crate	6m 57s
Build zebra-grpc crate	14m 55s
Build zebra-consensus crate	17m 42s
Build zebra-chain crate	5m 28s
Build tower-fallback crate	1m 8s
Build tower-batch-control crate	1m 28s
Open or update issues for building crates individually failures	0s
	3h 17m 40s

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