Add alternate LLEvents style for slua types xml

[WolfGangS]

Description

Add definition file data for the alternative style of subscribing to events in slua

Related Issues

secondlife/sl-vscode-plugin#41

---

Checklist

Please ensure the following before requesting review:

• I have provided a clear title and detailed description for this pull request.
• If useful, I have included media such as screenshots and video to show off my changes.
• The PR is linked to a relevant issue with sufficient context.
• I have tested the changes locally and verified they work as intended.
• All new and existing tests pass.
• Code follows the project's style guidelines.
• Documentation has been updated if needed.
• Any dependent changes have been merged and published in downstream modules
• I have reviewed the contributing guidelines.

---

Additional Notes

Doesn't affect viewer itself.