* write locks
* fix forkchoice tests
* blockchain locks
* lock on IsOptimistic
* use forkchoice instead of chaininfo within savehead
* Use forkchoice HasNode to check if a block is consistent with finality
* interface fix
* Use forkchoice HasNode to check if a block is consistent with finality
* interface fix
* fix tests
* remove VerifyFinalizedBlkDescendant
* don't write lock wrappers
* fix validateBeaconBlock
* Terence's review and more missing locks
* add lock for InForkChoice
* lock head on fillMissingBlockPayload
* fix lock on IsOptimisticForRoot
* fix lock in fillMissingBlockPayloadId
* extra comments
* lock proposerBoost on spectests
* nishant's review
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Co-authored-by: Nishant Das <nishdas93@gmail.com>