[shelly] Support for Shelly 2PM Gen3 device

[weyto]

Feature Request

Description
Currently, Shelly 2PM Gen3 devices are being incorrectly discovered as shelly:shellyunknown in openHAB 4.2.2. This leads to a non functional device in openHAB.

I request an update to the Shelly binding in openHAB to correctly identify and support Shelly 2PM Gen3 devices.

Environment:

• Device Model: Shelly 2PM Gen3 Devices
• Software Version: openHAB 4.2.2

Expected Behavior

The system should properly recognize the Shelly 2PM Gen3 devices and expose all supported features such as power monitoring, relay controls, and any other relevant functionalities.

Actual Behavior

Shelly 2PM Gen3 devices are currently discovered as shelly:shellyunknown, resulting in the device not functioning as intended within openHAB.