Add symbol search to broker api

piker/brokers/core.py

@@ -108,3 +108,15 @@ async def symbol_info(
     """
     async with brokermod.get_client() as client:
         return await client.symbol_info(symbol, **kwargs)
+
+
+async def symbol_search(
+    brokermod: ModuleType,
+    symbol: str,
+    **kwargs,
+) -> Dict[str, Dict[str, Dict[str, Any]]]:
+    """Return symbol info from broker.
+    """
+    async with brokermod.get_client() as client:
+        # TODO: support multiple asset type concurrent searches.
+        return await client.search_stocks(symbol, **kwargs)