Feat: Introduce eth_getTransactionBySenderAndNonce and additional protection mechanisms for cross chain transfers & reorgs

[sambacha]

New RPC Methods and Protection Mechanisms for Lz Transfers

We need to ensure that the DEST and SOURCE chain do not have differing views of a users state due to chain reorgs or liveness failures, etc.

• add a min. time lock regardless of chain
• support rpc method to assist in state verification for front end
• more radical solutions (not for RC v1.0)

### eth_getTransactionBySenderAndNonce

Consider this use case.

We journal everything we do. If the system dies we recover the state from that journal and move on. You need to re sync your local state with the chain first. That may mean a tx having been replaced. You can get the new tx, you can only try to fetch the old one and you receive a null.

With  `eth_getTransactionBySenderAndNonce` you just check which tx is using your nonce, if any.

[sambacha]

🥳 https://crosschainriskframework.github.io/framework/20categories/10network/network/

[ControlCplusControlV]

L0 removed and reverted in

[sambacha]

The proposed EIP spec is here: https://github.com/manifoldfinance/eip-proposal-rpc/blob/master/eth_getTransactionBySenderAndNonce.md

Just need to submit it now that the EIP repo has been split