feat(board): add support for Soldered NULA Dual ESP32C5

[franFodor]

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Description of Change

Add a board variant for the new Soldered NULA Dual ESP32C5 board by Soldered Electronics

• Add board configuration to boards.txt
• Add pin definitions to 'variants/soldered_nula_dual_esp32c5'

Test Scenarios

The Board variant was tested using the mentioned Soldered NULA Dual ESP32C5 board running on the arduino esp32 core ver. 3.3.8 using Arduino IDE ver. 2.3.8
The tests included trying all pin functionalities, UART, SPI and I2C (Qwiic) communication. PSRAM was tested using the functions ESP.getPsramSize() and ESP.getFreePsram()

Related links

As the board is not yet released, I'm providing pinout and an image of the board.
Nula Dual ESP32-C5 Schematic.pdf

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👋 Hello franFodor, we appreciate your contribution to this project!

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

@franFodor PTAL on my comments.

[franFodor]

@P-R-O-C-H-Y Hello, thank you for the suggestions and I have made the changes.

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

LGTM