feat(devboard): Add support for ESP32

[ZZ-Cat]

Overview

This Pull Request adds support for the ESP32 line of development boards.

Tasks

The following lists the development boards that are added to the Compatibility Table:

• [x] Adafruit Feather ESP32
• [x] Adafruit Feather ESP32-S2
• [x] Adafruit Feather ESP32-S3 (2 MB PSRAM)
• [x] Adafruit Feather ESP32-S3 (No PSRAM)
• [x] Adafruit ItsyBitsy ESP32
• [x] Adafruit Metro ESP32-S2
• [x] Adafruit QtPy ESP32 Pico
• [x] Adafruit QtPy ESP32-C3
• [x] Adafruit QtPy ESP32-S2
• [x] Adafruit QtPy ESP32-S3
• [x] Arduino Nano ESP32
• [x] Espressif ESP32-C3-DevKitC-02
• [x] Espressif ESP32-C3-DevKitM-1
• [x] Espressif ESP32-S3-DevKitC-1-N8
• [x] Seeed XIAO ESP32C3
• [x] Seeed XIAO ESP32S3
• [x] SparkFun RedBoard IoT ESP32
• [x] SparkFun Thing ESP32
• [x] SparkFun Thing Plus ESP32 WROOM
• [x] SparkFun Thing Plus ESP32-S2 WROOM

Plus many more, as time marches on.

Additional notes

Like I did with #37, this uses Serial1 by default. If need be, I may add support for more UART ports (wherever applicable) if requested.

If someone requests it, I may add support for the ESP32 predecessor (ESP8285 and ESP8266), because I am aware that ExpressLRS themselves target ESP8285 based transmitters and receivers for their firmware (which automatically tells me that the CRSF Protocol is fully compatible with ESP8285 and ESP8266).

[ZZ-Cat]

Right. This Pull Request is good to go. I don't have any ESP32 development boards available to me. So, I am relying on feedback from you all via my Issues tab, if anything isn't working the way it's supposed to.