docs: create centralized telemetry documentation

- Consolidated telemetry events from Hot Design, AI, Dev Server, Licensing, and IDE extensions
- Organized by category for easy reference
- Included event names, properties, measurements, and descriptions
- Added privacy & compliance section with GDPR information
- Documented data collection policies and opt-out procedures
- Cross-referenced individual repository documentation

Related to unoplatform/private#998

Co-authored-by: Jen-Uno <214558326+Jen-Uno@users.noreply.github.com>

Author: Copilot