blockstore: cmd line tools to read rocksdb and output block/microblock info #10941

Job	Run time
ledgers / ledger-replay	7m 14s
tests / test (linux_gcc_noarch64)	1m 2s
tests / test (linux_gcc_x86_64)	12m 34s
tests / test (linux_gcc_icelake)	7m 46s
tests / test (linux_clang_x86_64)	8m 21s
tests / test (linux_clang_icelake)	8m 41s
tests / test (native)	8m 28s
tests / test (native-no-agave)	3m 16s
ledgers / ledger-coverage	0s
	57m 22s

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