Unity Timeline Interaction System Integration (#17)

- Added InteractionTimelineAction component for timeline-driven interactions
- Implemented custom editor for timeline event mapping
- Updated interaction event flow to support timeline actions
- Enhanced character move target configuration
- Improved inspector UI for interactable components
- Added technical documentation for interaction system
- Refactored interaction action base classes for extensibility
- Fixed issues with character binding in timelines

Co-authored-by: Michal Pikulski <michal@foolhardyhorizons.com>
Co-authored-by: Michal Pikulski <michal.a.pikulski@gmail.com>
Reviewed-on: #17

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