feat(cli): add `shard` CLI command #764

Job	Run time
default / validate-protonet-genesis	1m 51s
default / test	9m 7s
default / build	2m 3s
default / validate-internal-testnet-genesis	30s
rocksdb / build	8m 17s
rocksdb / test	7m 30s
post-pipeline-metrics / metric-pipeline-result	3s
	29m 21s

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