feat: Rename Firebeetle ESP32 board definition

[matthias-bs]

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Description of Change

The previous board definition ESP32_DEV is used for several boards, i.e. it is not specific to the DFRobot FireBeetle ESP32 board. The proposed name has been chosen according to other DFRobot boards.

The change allows to compile code specific for the selected board. In my target application, a specific "FireBeetle Cover" (similar to a "HAT" or Adafruit's "Feather" concept) is assumed to be installed if this board is selected.

Tests scenarios

Related links

• https://wiki.dfrobot.com/FireBeetle_ESP32_IOT_Microcontroller(V3.0)__Supports_Wi-Fi_&_Bluetooth__SKU__DFR0478

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