update code paths in the network crate (#4065)

* wip

* fix router

* arc the byroot responses we send

* add placeholder for blob verification

* respond to blobs by range and blobs by root request in the most horrible and gross way ever

* everything in sync is now unimplemented

* fix compiation issues

* http_pi change is very small, just add it

* remove ctrl-c ctrl-v's docs

beacon_node/lighthouse_network/src/rpc/codec/ssz_snappy.rs

@@ -597,9 +597,9 @@ fn handle_v1_response<T: EthSpec>(
                 )
             })?;
             match fork_name {
-                ForkName::Eip4844 => Ok(Some(RPCResponse::SidecarByRoot(
+                ForkName::Eip4844 => Ok(Some(RPCResponse::SidecarByRoot(Arc::new(
                     BlobSidecar::from_ssz_bytes(decoded_buffer)?,
-                ))),
+                )))),
                 _ => Err(RPCError::ErrorResponse(
                     RPCResponseErrorCode::InvalidRequest,
                     "Invalid fork name for block and blobs by root".to_string(),

beacon_node/lighthouse_network/src/rpc/methods.rs

@@ -280,7 +280,7 @@ pub enum RPCResponse<T: EthSpec> {
     LightClientBootstrap(LightClientBootstrap<T>),
 
     /// A response to a get BLOBS_BY_ROOT request.
-    SidecarByRoot(BlobSidecar<T>),
+    SidecarByRoot(Arc<BlobSidecar<T>>),
 
     /// A PONG response to a PING request.
     Pong(Ping),