Implement gloas proposer preference vc duty (#9208)

Allow for the vc to submit its proposer preferences to the network


  


Co-Authored-By: Eitan Seri-Levi <eserilev@ucsc.edu>

Co-Authored-By: Jimmy Chen <jchen.tc@gmail.com>

beacon_node/beacon_chain/src/payload_bid_verification/tests.rs

@@ -252,11 +252,11 @@ fn make_signed_preferences(
 ) -> Arc<SignedProposerPreferences> {
     Arc::new(SignedProposerPreferences {
         message: ProposerPreferences {
+            dependent_root: Hash256::ZERO,
             proposal_slot,
             validator_index,
             fee_recipient,
             gas_limit,
-            ..ProposerPreferences::default()
         },
         signature: Signature::empty(),
     })