Block Processing PR's

[shane-moore]

Most of the gloas block processing related PR's that I've made have been upstreamed to sigp:

• Gloas containers additions
• Gloas modify process_withdrawals
• Gloas modify process_attestations
• Gloas add process_payload_attestation
• Gloas process epoch
• Gloas modify get_pending_balance_to_withdraw
• Gloas process execution payload bid

additionally, we can upstream the ptc cache PR whenever it makes sense.

Note that these PR's were updated against the consensus spec release v1.6.0-beta.1, which contains the latest spec changes expected for the devnet-0 launch