feat: add tfsort IAC tool

[davidjeddy]

Summary

Description:

• Tool repo URL: https://github.com/AlexNabokikh/tfsort
• Plugin repo URL: https://github.com/davidjeddy/asdf-tfsort

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