feat(zebra-scan): Connect with zebrad #320

Job	Run time
Generate crates matrix	16s
Check crates matrix	2s
Build tower-batch-control crate	30s
Build tower-fallback crate	23s
Build zebra-chain crate	2m 0s
Build zebra-consensus crate	7m 32s
Build zebra-network crate	2m 4s
Build zebra-node-services crate	1m 57s
Build zebra-rpc crate	7m 44s
Build zebra-scan crate	6m 8s
Build zebra-script crate	1m 43s
Build zebra-state crate	7m 18s
Build zebra-test crate	48s
Build zebra-utils crate	8m 1s
Build zebrad crate	11m 0s
Open or update issues for building crates individually failures	0s
	57m 26s

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