feat: add powerpipe

[jc00ke]

Summary

Description: Adding turbot's powerpipe which was recently separated from steampipe which is already listed in this registry.

• Tool repo URL: https://github.com/turbot/powerpipe
• Plugin repo URL: https://github.com/jc00ke/asdf-powerpipe

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

[jc00ke]

I'm seeing Actions startup failures, so CI tests are red at the moment. But, I've installed powerpipe myself and it looks good.