Couple blocks and blobs in gossip (#3670)

* Revert "Add more gossip verification conditions"

This reverts commit 1430b561c3.

* Revert "Add todos"

This reverts commit 91efb9d4c7.

* Revert "Reprocess blob sidecar messages"

This reverts commit 21bf3d37cd.

* Add the coupled topic

* Decode SignedBeaconBlockAndBlobsSidecar correctly

* Process Block and Blobs in beacon processor

* Remove extra blob publishing logic from vc

* Remove blob signing in vc

* Ugly hack to compile

common/eth2/src/lib.rs

@@ -608,7 +608,7 @@ impl BeaconNodeHttpClient {
     /// Returns `Ok(None)` on a 404 error.
     pub async fn post_beacon_blobs<T: EthSpec>(
         &self,
-        block: &SignedBlobsSidecar<T>,
+        block: &BlobsSidecar<T>,
     ) -> Result<(), Error> {
         let mut path = self.eth_path(V1)?;