Use zcash_script’s new `Script` trait #2366

Job	Run time
Generate crates matrix	11s
Check crates matrix	2s
Build zebrad crate	34m 37s
Build zebra-utils crate	15m 24s
Build zebra-test crate	1m 24s
Build zebra-state crate	21m 9s
Build zebra-script crate	3m 56s
Build zebra-scan crate	23m 33s
Build zebra-rpc crate	32m 8s
Build zebra-node-services crate	3m 9s
Build zebra-network crate	7m 24s
Build zebra-grpc crate	14m 4s
Build zebra-consensus crate	16m 47s
Build zebra-chain crate	5m 16s
Build tower-fallback crate	1m 2s
Build tower-batch-control crate	1m 25s
Open or update issues for building crates individually failures	0s
	3h 1m 31s

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