Web3 Signer integration updates for merge

[james-prysm]

💎 Issue

Background

This issue tracks changes for web3signer with regards to the merge

Description

we will need to update the types to include the block v3 type
also the block body for the request will need to change; reference to the following issue below.
Consensys/web3signer#437
Consensys/web3signer#459
Consensys/web3signer#606

Bellatrix changes Consensys/teku#5354

For Bellatrix fork, send block_header instead of block for external signer block signing request (BLOCK_V2). block_header contains body_root instead of complete beacon block body which significantly reduces the traffic between Teku and external signer for block signing request.

Either block_header or block can be used to calculate signing root by the external signer. For backward compatibility with PHASE0 and ALTAIR forks, only block is sent; for Bellatrix and later forks, only block_header is sent.

Prysm uses BLOCK_V3 Instead

Tasks

• manage bellatrix blocks ( blockv3/ handling block body to block header in payload)
• handling blinded blocks
• validator registration signing ( MEV/Builder)

[ghost]

good work man, im new but i love this