fix(security): fix concurrency issues in tree key formats, and CPU usage in genesis tree roots #80

Job	Run time
Generate crates matrix	13s
Check crates matrix	1s
Build tower-batch-control crate	3s
Build tower-fallback crate	2s
Build zebra-chain crate	3s
Build zebra-consensus crate	3s
Build zebra-network crate	1s
Build zebra-node-services crate	1s
Build zebra-rpc crate	7s
Build zebra-script crate	1s
Build zebra-state crate	1s
Build zebra-test crate	1s
Build zebra-utils crate	2s
Build zebrad crate	3s
	42s

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