feat: add egnor/arduino-cli

[egnor]

Summary

Description: Arduino CLI

• Tool repo URL: https://github.com/arduino/arduino-cli
• Plugin repo URL: https://github.com/egnor/asdf-arduino-cli

Checklist

• Format with scripts/format.bash
• Test locally with scripts/test_plugin.bash --file plugins/<your_new_plugin_name>
• Your plugin CI tests are green
  • Tip: use the plugin_test action from asdf-actions in your plugin CI