boards: dfrobot: Add DFRobot Beetle ESP32-C3 board

[rosowskimik]

Add support for the DFRobot Beetle ESP32-C3 board. This is a small IoT development board based on the Espressif ESP32-C3 RISC-V SoC.

Board features:

• ESP32-C3 (32-bit RISC-V at 160MHz)
• 400KB SRAM, 4MB Flash
• 2.4GHz WiFi and BLE
• 13x IO ports
• Integrated lithium battery charging management

The board has been tested with the following Zephyr samples:

• samples/basic/blinky
• samples/hello_world
• samples/net/wifi/shell

[github-actions]

Hello @rosowskimik, and thank you very much for your first pull request to the Zephyr project!
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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

Hi @rosowskimik!
Congratulations on getting your very first Zephyr pull request merged 🎉🥳. This is a fantastic achievement, and we're thrilled to have you as part of our community!

To celebrate this milestone and showcase your contribution, we'd love to award you the Zephyr Technical Contributor badge. If you're interested, please claim your badge by filling out this form: Claim Your Zephyr Badge.

Thank you for your valuable input, and we look forward to seeing more of your contributions in the future! 🪁