* forkchoice: add `HasParent` and `AncestorRoot` getters
* Tests
* Interfaces
* process block: use getters in `ancestor`
* Update tests
* Merge branch 'master' of github.com:prysmaticlabs/prysm into faster-ancestor-block
* feedback from @rauljordan
* Add proto array fork choice object to RPC
* Add pb
* Add pb
* Expose proto array store object
* Test
* Merge branch 'forkchoice-endpoint' of github.com:prysmaticlabs/prysm into forkchoice-endpoint
* s/Nodes/nodes
* Remove proto from gitignore
* More implementations of GetProtoArrayForkChoice
* Comments
* Use hex
* Gazelle
* GetForkChoice Test
* Remove pb.go
* Merge branch 'master' into forkchoice-endpoint
* Typo, thanks Raul!
* Merge branch 'forkchoice-endpoint' of github.com:prysmaticlabs/prysm into forkchoice-endpoint
* Upon start up, don't insert head to proto array node DAG as index 0
* Merge branch 'master' of git+ssh://github.com/prysmaticlabs/prysm into fix-save-head-root
* Add HasNode
* Add fillInForkChoiceMissingBlocks
* Comments
* Test
* Fixed test
* Merge branch 'master' into proto-array-process-missing-block
* Merge branch 'master' into proto-array-process-missing-block
* Merge branch 'master' into proto-array-process-missing-block
* Run time
* Fixed pruning
* Fixed test
* Fixed test
* Process attestations during init sync
* Raul's feedback
Co-authored-by: prylabs-bulldozer[bot] <58059840+prylabs-bulldozer[bot]@users.noreply.github.com>