Add pending_consolidations Beacon API endpoint (#7290)

#7282


  Adds the missing `beacon/states/{state_id}/pending_consolidations` Beacon API endpoint along with related tests.

beacon_node/http_api/tests/tests.rs

@@ -1246,6 +1246,33 @@ impl ApiTester {
         self
     }
 
+    pub async fn test_beacon_states_pending_consolidations(self) -> Self {
+        for state_id in self.interesting_state_ids() {
+            let mut state_opt = state_id
+                .state(&self.chain)
+                .ok()
+                .map(|(state, _execution_optimistic, _finalized)| state);
+
+            let result = self
+                .client
+                .get_beacon_states_pending_consolidations(state_id.0)
+                .await
+                .unwrap()
+                .map(|res| res.data);
+
+            if result.is_none() && state_opt.is_none() {
+                continue;
+            }
+
+            let state = state_opt.as_mut().expect("result should be none");
+            let expected = state.pending_consolidations().unwrap();
+
+            assert_eq!(result.unwrap(), expected.to_vec());
+        }
+
+        self
+    }
+
     pub async fn test_beacon_headers_all_slots(self) -> Self {
         for slot in 0..CHAIN_LENGTH {
             let slot = Slot::from(slot);
@@ -6404,6 +6431,8 @@ async fn beacon_get_state_info_electra() {
         .test_beacon_states_pending_deposits()
         .await
         .test_beacon_states_pending_partial_withdrawals()
+        .await
+        .test_beacon_states_pending_consolidations()
         .await;
 }