Feature: RBF

[borislav-itskov]

Change log:

• when 15 minutes pass and the txn is still BroadcastButNotConfirmed, switch it to BroadcastButStuck. Before, it was switched to Rejected
• create a getNotConfirmedOpIfAny in activity.ts. For SA, it checks the last BroadcastButNotConfirmed/BroadcastButStuck txn's nonce and compares. For EOAs, it gets all the BroadcastButNotConfirmed/BroadcastButStuck txns for the EOA + all the SA as the EOA could've broadcast a txn there. It returns the op with the highest nonce
• it disregards 4337 broadcasts as they shouldn't have an RBF (bundler should always broadcast)
• in the case of RBF, in signAccountOp.ts it uses the gas estimation from the stuck account op increased by 12.5% OR the new estimation, whichever is higher
• upon broadcast, if the broadcast fails with "replacement fee too low", the signedAccountOp's gas fee payment is taken, increased by 12.5% and used for estimation IF the provided estimation from estimate.ts is lower than it. This repeats until a successful broadcast