Support negative heights in `HashOrHeight` #2586

Job	Run time
Generate crates matrix	8s
Check crates matrix	4s
Build zebrad crate	33m 39s
Build zebra-utils crate	16m 18s
Build zebra-test crate	1m 37s
Build zebra-state crate	30m 9s
Build zebra-script crate	3m 47s
Build zebra-scan crate	22m 55s
Build zebra-rpc crate	31m 10s
Build zebra-node-services crate	4m 7s
Build zebra-network crate	6m 17s
Build zebra-grpc crate	13m 13s
Build zebra-consensus crate	15m 39s
Build zebra-chain crate	5m 3s
Build tower-fallback crate	1m 1s
Build tower-batch-control crate	1m 16s
Open or update issues for building crates individually failures	0s
	3h 6m 23s

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