Add payload attestation to op pool and pack into block (#9180)

Store gossip-verified `PayloadAttestationMessage`s in the operation pool and pack them into the block body at during block production.

Built on top of #9145.


  


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

beacon_node/beacon_chain/src/beacon_chain.rs

@@ -61,6 +61,7 @@ use crate::observed_data_sidecars::ObservedDataSidecars;
 use crate::observed_operations::{ObservationOutcome, ObservedOperations};
 use crate::observed_slashable::ObservedSlashable;
 use crate::partial_data_column_assembler::PartialMergeResult;
+use crate::payload_attestation_verification::VerifiedPayloadAttestationMessage;
 use crate::payload_bid_verification::payload_bid_cache::GossipVerifiedPayloadBidCache;
 #[cfg(not(test))]
 use crate::payload_envelope_streamer::{EnvelopeRequestSource, launch_payload_envelope_stream};
@@ -2328,6 +2329,17 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
             .map_err(Into::into)
     }
 
+    /// Add a verified payload attestation message to the operation pool for block inclusion.
+    pub fn add_payload_attestation_to_pool(
+        &self,
+        verified: &VerifiedPayloadAttestationMessage<T>,
+    ) -> Result<(), Error> {
+        self.op_pool
+            .insert_payload_attestation_message(verified.payload_attestation_message().clone())
+            .map_err(Error::OpPoolError)?;
+        Ok(())
+    }
+
     /// Accepts some `SyncCommitteeMessage` from the network and attempts to verify it, returning `Ok(_)` if
     /// it is valid to be (re)broadcast on the gossip network.
     pub fn verify_sync_committee_message_for_gossip(