feat: Add Supabase CLI plugin

[gavinying]

Summary

Description:

• Tool repo URL: https://github.com/supabase/cli
• Plugin repo URL: https://github.com/gavinying/asdf-supabase-cli

Checklist

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

[jthegedus]

Thanks!