Investigate and potentially fix "blocking call to import_module"

[snicker]

from https://community.home-assistant.io/t/zwift-sensor-component-feedback-and-testers-needed/87512/325

Found this in my log today:
2024-07-25 17:39:47.451 WARNING (MainThread) [homeassistant.util.loop] Detected blocking call to import_module with args (‘google._upb._message’,) inside the event loop by custom integration ‘zwift’ at custom_components/zwift/zwift_patch/zwift_messages_pb2.py, line 5: from google.protobuf import descriptor as _descriptor (offender: /usr/local/lib/python3.12/site-packages/google/protobuf/internal/api_implementation.py, line 41: mod = importlib.import_module(mod_name)), please report it to the author of the ‘zwift’ custom integration
For developers, please see Blocking operations with asyncio | Home Assistant Developer Docs 2

OS Version: Home Assistant OS 12.4
Home Assistant Core: 2024.7.4

[snicker]

it appears that this is a side effect of the hack implemented to fix #37, but will probably have to deal with this later as it shouldn't be majorly impactful.