feat(board): add support for Soldered NULA Mini ESP32C6

[JosipKuci]

Add board definition for upcoming Soldered NULA Mini ESP32C6 board by Soldered Electronics

• Add board configuration to boards.txt
• Add pin definitions to 'variants/soldered_nula_mini_esp32c6'

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Test Scenarios

The definition was tested via Arduino IDE 2.3.5, testing Wi-FI and Bluetooth connectivity, I2C as well as the pins themselves

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All committers have signed the CLA.

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[P-R-O-C-H-Y]

@JosipKuci Hi, can you please attach some documentation or data sheet for the board? I want to check what flash size options your board is available with.

[rsoric]

Hi @P-R-O-C-H-Y ,

thanks for reviewing! Our board will only have one variant: ESP32-C6-MINI-1-N4 so it's 4 MB (Quad SPI). Hope that helps clear things up. The board essentially contains the microcontroller, battery connector and charger and the USB-UART bridge. We are working on detailed documentation and product images at this moment. I will happily send a schematic or prototype photos/videos to demonstrate our board if needed.

All the best
-Rob

[P-R-O-C-H-Y]

Ptal and remove unsupported options for the board.

[rsoric]

Hi @P-R-O-C-H-Y and @me-no-dev, thank you kindly for the correspondence and prompt merge

We're excited to have this ready for our product launch!

All the best
-Rob