Crosschain broadcaster BlockHashProver contract development

[pepebndc]

"Perform production implementation of BlockHashProver.sol contracts per rollup stack, including:

• Validate prebuilt prover implementations for Arbitrum and OP stack
• Develop prover implementations for ZKSync, Scroll, Linea, Taiko
  Ensure compatibility with other OIF smart contract modules (escrow, resource locks, etc) and solver tooling

Does not include audits"

[0xallan]

noting this is a deliverable for Milestone 1, as outlined in the grant agreement