* Persist Dag
* Add schema
* Add new message
* add mapping
* Adding check to save block
* Removing blocks mapping
* Make changes to block processing
* Change from mapping to a slice of hashes
* Adding tests to core
* adding more tests
* Fixing service test
* Add comments and fix bazel
* fix lint
* fix conflicts
* addressing review comments
* Removing references to active
* fixing tests with active state
* Protytype for #440: Persist blocks and latest state in DB
* simplify code
* removing block registry
* fix test
* adding block removal/iterator
* Addressing review comments
* Addressing comments
* Adding block request
* removing extra line
* making vars private and adding canonical key
* fix lint
* splitting methods
* adding more changes
* lint
* improving coverage
* removing decodeslotnumber
* Able to search for and send blocks
* adding core tests
* adding tests
* adding documentation
* addressing raul's comments
* lint and gazelle
* addressing yutaro's comments
* improving coverage
* improve coverage
* improving coverage
* begin with a block/state dag approach in prep for fork choice
* add TODOs for fork choice items, add data structure for forks
* remove syncing and processing states for incoming block sync
* simulator only broadcasts blocks now, no more state simulation
* fix sim tests, no more state sim
* bazel rerun
* naive fork choice
* split update head routine
* pesky race conditions
* fork choice rule works
* dag + fork choice working
* canonical head storage across sessions
* todo: save dag
* no more stalling after 10 blocks, using event feeds
* address review
* sync instead uses event feed
* refactored pure funcs into casper package
* tests pass
* fix lint
* refactor get blockhash
* refactor blockhashforslot
* event feed for incoming blocks in chainservice
* use config
* addressed all comments
* fix typo
* address yutaro comment
* using db interface
* check if parent hash in previous slot DAG
* works
* tests
* drop ffg suffix
* bazel gazelle
* full cov validators by height shard
* gazelle
* state tests
* all state tests
* 100% cov types and 99% cover casper
* cov up
* 80% blockchain cov
* fix lint
