Log track back in on_packet

Many errors are raised in on_packet() callbacks, but currently it only
provides a very brief error message.

bumble/transport/common.py

@@ -21,6 +21,7 @@
 import asyncio
 import logging
 import io
+import traceback
 from typing import ContextManager, Tuple, Optional, Protocol, Dict
 
 from bumble import hci
@@ -153,6 +154,7 @@ def feed_data(self, data: bytes) -> None:
                             logger.warning(
                                 color(f'!!! Exception in on_packet: {error}', 'red')
                             )
+                            logger.warning(traceback.format_exc())
                     self.reset()
 
     def set_packet_sink(self, sink: TransportSink) -> None: