feat: add scaffold from hay-kot/scaffold

[particledecay]

Summary

Description: Add the scaffold plugin.

• Tool repo URL: https://github.com/hay-kot/scaffold
• Plugin repo URL: https://github.com/particledecay/asdf-scaffold

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

[particledecay]

Can anyone please review this? Do you need additional contributors?

[jthegedus]

Hey, sorry for the delay. Plugins can be used without being in this repository via asdf plugin add <name> <git_url>, it is the method we encourage users to use.

Aside from the better discoverability, delays to merges here should not impact the usability of your plugin to your users.

Thanks for contributing to the ecosystem.