* refactor repo to use protos
* removed block successfully in types
* db package updated
* db, core passing
* chain service done
* no more block instances
* all pass
* deprecate all block protos
* tests pass
* WIP: Dummy db clean service
* [WIP. NOT READY FOR REVIEW] Add DB cleanup routine that cleans block vote cache
* Add missing bazel config
* Put DB clean behind a CLI flag
* Address review comments
* Fix error handling