Some legacy iot firmware stops responding when an unsupported module follows `system` in a request, which made every update time out once the HomeKit query was added.
This stops querying HomeKit in `update()` for IOT devices and adds `Device.supports_module()` API to allow checking if some module is supported by the device.
Based on the existing smart HomeKit module, this has been tested with a real device that supports this module.
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Co-authored-by: Teemu Rytilahti <tpr@iki.fi>
* Transport tests under tests/transports/
* Protocol tests under tests/protocols/
* IOT tests under iot/
* Plus some minor cleanups, most code changes are related to splitting
up smart & iot tests
