finalizeWithdrawal: specify the proofSubmitter

[hamdiallam]

OptimismPortal2 introduces finalizeWithdrawalTransactionExternalProof such that the calling sender does not have to match the original proof submittor.

With the current structure of the viem hook, the caller must be the proof submitter in order for the finalizing tx to succesfully execute

Introduce an optional proofSubmittor argument to the simulating and executing hook for finalizeWithdrawalTransaction. If set, use the the altered function. This introduces this functionality in a backwards compatible way.

• Although from a DevX perspective, it would make more sense for viem to auto-select a proof submitting address that is passing such that the user doesn't need to explicitly know. There's no security implications as long as a valid proof submitter is used. The optionality is to prevent grieving of valid proof submissions by frontrunning with invalid games.
• Note: Inclusion of a valid proof submitter in the withdrawal status (it already queries this internally) would be a breaking change with the return return type. Let me know thoughts here, happy to refactor this in agreement

[changeset-bot]

🦋 Changeset detected

Latest commit: 13f1bee

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
viem	Patch

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[jxom]

• Please rename from "submittor" to "submitter".
• Needs a changeset (pnpm changeset)
• Need to add proofSubmitter to docs.