feat: add uv plugin

[jylenhof]

Summary

Description:

• Tool repo URL: https://github.com/astral-sh/uv
• Plugin repo URL: https://github.com/jylenhof/asdf-uv

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

[jthegedus]

The asdf-community version for a UV plugin has already been added. If you want this version also added, you will need to rename the plugins/uv file to avoid the clashing name.