* Change forkchoice API
doubly-linked-tree changes
* protoarray changes
* blockchain tests
* rebase and fix conflicts
* More blockchain fixes
* blockchain test fixes
* doubly linked tree changes again
* protoarray changes v2
* blockchain packages v2
* Radek's review
* Fix on batch processing
* Terence's review
* fill in at start
* Revert "fill in at start"
This reverts commit 8c11db063a02a59df8e0ac6d0af0c8923921dc76.
* wrap error message
* fill in before mutating the state
* wrap nil node errors
* handle unknown optimistic status on init sync
* rename insert function
* prune on batches only after forkchoice insertion
Co-authored-by: terencechain <terence@prysmaticlabs.com>
