Handle connection errors during event writes

[teancom]

I see this error pretty much every time I restart the openWakeWord app in Home Assistant:

ERROR:asyncio:Task exception was never retrieved
future: <Task finished name='wyoming event handler' coro=<AsyncEventHandler.run() done, defined at /usr/local/lib/python3.11/dist-packages/wyoming/server.py:31> exception=ConnectionResetError('Connection lost')>
Traceback (most recent call last):
  File "/usr/local/lib/python3.11/dist-packages/wyoming/server.py", line 41, in run
    if not (await self.handle_event(event)):
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/dist-packages/wyoming_openwakeword/handler.py", line 62, in handle_event
    await self.write_event(info.event())
  File "/usr/local/lib/python3.11/dist-packages/wyoming/server.py", line 29, in write_event
    await async_write_event(event, self.writer)
  File "/usr/local/lib/python3.11/dist-packages/wyoming/event.py", line 136, in async_write_event
    await writer.drain()
  File "/usr/lib/python3.11/asyncio/streams.py", line 378, in drain
    await self._protocol._drain_helper()
  File "/usr/lib/python3.11/asyncio/streams.py", line 167, in _drain_helper
    raise ConnectionResetError('Connection lost')
ConnectionResetError: Connection lost
[16:53:33] INFO: Successfully sent discovery information to Home Assistant.

Did a bit of digging, tracked it down to this. Commit message follows.

Add exception handling for ConnectionResetError, ConnectionError, and BrokenPipeError in both AsyncEventHandler.run() and async_write_event() to prevent "Task exception was never retrieved" errors when clients disconnect. Client disconnects are normal and shouldn't be treated as exceptional conditions.