* Add blockstore column to cache block times
* Add method to cache block time
* Add service to cache block time
* Update rpc getBlockTime to use new method, and refactor blockstore slightly
* Return block_time with confirmed block, if available
* Add measure and warning to cache-block-time
* Freeze address-signature index in the middle of slot to show failure case
* Secondary filter on signature
* Use AddressSignatures iterator instead of manually decrementing slots
* Remove unused method
* Add metrics
* Add transaction-status-index doccumentation
* Add panicking test
* Add failing test: fresh transaction-status column shouldn't point at valid root 0
* Prevent transaction status match outside of primary-index bounds
* Initialize transaction-status and address-signature primer entries with Slot::MAX
* Revert "Add failing test: fresh transaction-status column shouldn't point at valid root 0"
This reverts commit cbad2a9fae22e5531e3b4ff1b0a9d6a223826c71.
* Revert "Initialize transaction-status and address-signature primer entries with Slot::MAX"
This reverts commit ffaeac0669d0cbe18dd68b5ce177e15a92360b72.
* Fix purging happening every slot when cleanup service is not started at slot 0
* Purge by shred count instead of slots since slots can have variable
number of shreds
* Separate client types into own crate, so ledger does not need it
Removes about 50 crates of dependency from ledger
* Drop Rpc name from transaction-status types