feat: add optimistic v3 types

[efbig]

📝 Summary

Add types for optimistic V3.

✅ I have completed the following steps:

• Run make lint
• Run make test
• Added tests (if applicable)

[Copilot]

Pull Request Overview

This PR adds types for optimistic V3 bidding to support an enhanced MEV-boost protocol version. The changes refactor the module structure to separate block submission from header submission functionality and introduce new types for optimistic V3 operations.

• Refactors MEV-boost module structure by renaming submission to block_submission and adding header_submission module
• Adds complete optimistic V3 type definitions including signed payload requests and verification functions
• Introduces bid adjustment data V2 with additional fields for SSZ merkle proofs and logs bloom

Reviewed Changes

Copilot reviewed 13 out of 15 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
crates/rbuilder/src/mev_boost/optimistic_v3.rs	New module defining optimistic V3 types and verification functions
crates/rbuilder/src/mev_boost/header_submission.rs	New module with header submission types for optimistic V3
crates/rbuilder/src/mev_boost/adjustment.rs	Adds BidAdjustmentDataV2 with new fields for optimistic V3
crates/rbuilder/src/mev_boost/mod.rs	Updates module structure and imports for refactored submission modules
Multiple files	Updates import paths from submission to block_submission

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