Add GarthDB/ha-wattbox integration
- SnapAV Wattbox power distribution unit integration
- Modern Home Assistant architecture with coordinator pattern
- Comprehensive test coverage (110 tests, 81% coverage)
- HACS compliant with all required files and documentation
- Supports binary sensors, sensors, and switches for outlet control
- Real-time power monitoring and device status tracking
Co-authored-by: Joakim Sørensen <joasoe@proton.me>