* Add `knx.telegram` integration specific trigger
* Move implementation to trigger.py, use it from device_trigger
* test device_trigger
* test trigger.py
* Add "incoming" and "outgoing" and handle legacy device triggers
* work with mixed group address styles
* improve coverage
* Add no-op option
* apply changed linting rules
* Don't distinguish legacy device triggers from new ones
that's now supported since frontend has fixed default values of extra_fields
* review suggestion: reuse trigger schema for device trigger extra fields
* cleanup for readability
* Remove no-op option
