binance: pass `MktPair` to `Client.bars()`

To get futures feeds correctly loading when selected from search (like
'XMRUSDT.USDTM.PERP'), expect a `MktPair` input to `Client.bars()` such
that the exact venue-key can be looked up (via a new `.pair2venuekey()`
meth) and then passed to `._api()`.

piker/brokers/binance/feed.py

@@ -252,13 +252,16 @@ async def open_history_client(
             else:
                 client.mkt_mode = 'spot'
 
-            # NOTE: always query using their native symbology!
+            array: np.ndarray = await client.bars(
-            mktid: str = mkt.bs_mktid
+                mkt=mkt,
-            array = await client.bars(
-                mktid,
                 start_dt=start_dt,
                 end_dt=end_dt,
             )
+            if array.size == 0:
+                raise NoData(
+                    f'No frame for {start_dt} -> {end_dt}\n'
+                )
+
             times = array['time']
             if (
                 end_dt is None