Implement get_attester_head logic

consensus/fork_choice/src/fork_choice.rs

@@ -489,6 +489,7 @@ where
             store.justified_balances(),
             store.proposer_boost_root(),
             store.equivocating_indices(),
+            store.unsatisfied_inclusion_list_block(),
             current_slot,
             spec,
         )?;
@@ -626,6 +627,14 @@ where
             .map_err(Error::FailedToProcessInvalidExecutionPayload)
     }
 
+    // TODO(focil) add documentation
+     pub fn on_invalid_inclusion_list_payload(
+        &mut self,
+        block_root: Hash256,
+    ) {
+        self.fc_store.set_unsatisfied_inclusion_list_block(block_root);
+    }
+
     /// Add `block` to the fork choice DAG.
     ///
     /// - `block_root` is the root of `block.

consensus/fork_choice/src/fork_choice_store.rs

@@ -79,4 +79,10 @@ pub trait ForkChoiceStore<E: EthSpec>: Sized {
 
     /// Adds to the set of equivocating indices.
     fn extend_equivocating_indices(&mut self, indices: impl IntoIterator<Item = u64>);
+
+    /// Returns the `unsatisfied_inclusion_list_block`.
+    fn unsatisfied_inclusion_list_block(&self) -> Hash256;
+
+    /// Sets the `unsatisfied_inclusion_list_block`.
+    fn set_unsatisfied_inclusion_list_block(&mut self, block_root: Hash256);
 }