draft(optimism): sendRawTransactionConditional

[hamdiallam]

Leaving a few comments in the different places that might require changes. Will flesh out an implementation after a soft approval/guidance in the right direction

1. OpTransactionSigned / OpPooledTransaction. References to conditional and notion of rejected

   • The builder interfaces with OpTransactionSigned. We need reference to the conditional to validate during execute_best_transactions and a means to invalidate from the pool.

2. L2EthApiExt & OpTransactionSigned: Can the conditional be attached as an optional field on the deserialized tx? This way pool::add_transaction is simply used. Or should a pool wrapper have a separate interface for submission.

3. PoolWrapper -> If we wrap the Pool interface, should this filter out the rejected txs and in a background task remove them from the pool?

   • We could implement the validation logic in validate_one which would duplicate the conditional checks