feat(utxorpc): add block to WatchTx

src/serve/grpc/watch.rs

@@ -164,8 +164,12 @@ fn block_to_txs<C: LedgerContext>(
         })
         .map(|x| u5c::watch::AnyChainTx {
             chain: Some(u5c::watch::any_chain_tx::Chain::Cardano(x)),
-            // TODO(p): should it be none?
-            block: None,
+            block: Some(u5c::watch::AnyChainBlock {
+                native_bytes: body.to_vec().into(),
+                chain: Some(u5c::watch::any_chain_block::Chain::Cardano(
+                    mapper.map_block_cbor(body),
+                )),
+            }),
         })
         .collect()
 }