This ticket should change the code that validates transaction requests and sets up transaction state based on request options to support the new "startOrContinue" transaction option. Specifically, this ticket should:

• Pass TransactionParticipant::TransactionActions::kStartOrContinue to TransactionParticipant::beginOrContinue() if "startOrContinue" exists on the sessionOptions (it should always be true if it exists)
• Change this uassert to allow a readConcern to be set if startOrContinueTransaction is true regardless of whether the statement is the first in the transaction
• Call _setLockStateForTransaction if startOrContinueTransaction is true