add a bunch of blob coupling boiler plate, add a blobs by root request

beacon_node/network/src/router/mod.rs

@@ -171,6 +171,9 @@ impl<T: BeaconChainTypes> Router<T> {
             Request::BlobsByRange(request) => self
                 .processor
                 .on_blobs_by_range_request(peer_id, id, request),
+            Request::BlobsByRoot(request) => self
+                .processor
+                .on_blobs_by_root_request(peer_id, id, request),
         }
     }
 
@@ -199,6 +202,10 @@ impl<T: BeaconChainTypes> Router<T> {
                 self.processor
                     .on_blobs_by_range_response(peer_id, request_id, beacon_blob);
             }
+            Response::BlobsByRoot(beacon_blob) => {
+                self.processor
+                    .on_blobs_by_root_response(peer_id, request_id, beacon_blob);
+            }
         }
     }