Add PeerDAS RPC import boilerplate (#6238)

* Add PeerDAS RPC import boilerplate

* revert refactor

* Remove allow

beacon_node/beacon_chain/src/data_column_verification.rs

@@ -177,7 +177,7 @@ impl<T: BeaconChainTypes> GossipVerifiedDataColumn<T> {
     pub fn id(&self) -> DataColumnIdentifier {
         DataColumnIdentifier {
             block_root: self.block_root,
-            index: self.data_column.data_column_index(),
+            index: self.data_column.index(),
         }
     }
 
@@ -221,7 +221,7 @@ impl<E: EthSpec> KzgVerifiedDataColumn<E> {
         self.data.clone()
     }
 
-    pub fn data_column_index(&self) -> u64 {
+    pub fn index(&self) -> ColumnIndex {
         self.data.index
     }
 }