feat: Add tinytex

[Fbrisset]

Summary

Description: Add plugin for tinytex

• Tool repo URL: https://github.com/rstudio/tinytex
• Release repo URL : https://github.com/rstudio/tinytex-releases
• Plugin repo URL: https://github.com/Fbrisset/asdf-tinytex

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]

Thanks