* Docs
* Interface definitions
* Fmt and gazelle
* Rename interface to interfaces
* Define all the type for protoarray
* Gaz
* Add error types
* Add compute delta helper
* Compute delta tests
* Gaz
* Add checking if nodes viable
* Test for viable head
* Test for non leaf node can lead to viable head
* Conflict
* Extra space
* Remove fmt print
* Add updateBestChildAndDescendant
* Tests
* Merge branch 'master' into proto-array-forkchoice-6
* Conflict
* Merge branch 'proto-array-forkchoice-6' of git+ssh://github.com/prysmaticlabs/prysm into proto-array-forkchoice-6
* Add applyScoreChanges
* More test
* Rename score to weight
* Conflict
* Add insert function
* Test
* Merge refs/heads/master into proto-array-forkchoice-8
* Merge refs/heads/master into proto-array-forkchoice-8
* Merge branch 'master' of git+ssh://github.com/prysmaticlabs/prysm into proto-array-forkchoice-8
* Merge branch 'proto-array-forkchoice-8' of git+ssh://github.com/prysmaticlabs/prysm into proto-array-forkchoice-8
* Add prune method
* Tests
* Fixed long line
* Docs
* Interface definitions
* Fmt and gazelle
* Rename interface to interfaces
* Define all the type for protoarray
* Gaz
* Add error types
* Add compute delta helper
* Compute delta tests
* Gaz
* Fix formatting and comments
* Apply suggestions from code review
Co-authored-by: Ivan Martinez <ivanthegreatdev@gmail.com>