feat(cli): add `shard` CLI command #797

Job	Run time
rocksdb / test	7m 54s
rocksdb / build	7m 17s
default / test	8m 50s
default / build	18s
default / validate-internal-testnet-genesis	54s
default / validate-protonet-genesis	21s
post-pipeline-metrics / metric-pipeline-result	8s
	25m 42s

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