PAINTROID-451: feat: Add Advanced Options (Antialiasing and Smoothing)

[this-is-varunxyz]

This PR introduces the "Advanced Options" dialog to the workspace overflow menu, allowing users to toggle Antialiasing and Smoothing for drawing tools.

Jira Ticket: PAINTROID-451

New Features and Enhancements

• Advanced Options UI: Built the AdvancedSettingsDialog accessible via the Top App Bar overflow menu to toggle features, following the ToolOptions state data patterns.
• State Management: Integrated AdvancedSettingsStateData using Riverpod and Freezed to securely manage the global state of the antialiasing and smoothing toggles.
• Dynamic Antialiasing Engine: - Intercepted PaintProvider and updated GraphicFactory.copyPaintWith() to conditionally apply isAntiAlias to the global Paint object.
  • Propagated the global antialiasing state to the broader toolset, including Watercolor, Shapes (ShapeDrawingUtils), Line, Spray, and Clipboard tools.
  • Replicated the legacy Native Android 1-pixel edge case (automatically disabling AA if strokeWidth <= 1.0).
• Real-Time Catmull-Rom Smoothing: Ported the custom legacy spline algorithms (AdvancedSettingsAlgorithms) from Native Kotlin into the Flutter BrushTool.
  • Implemented the speed threshold rule (distance/time) to only activate smoothing on fast strokes.
  • Engineered a Hardware Density Filter (distFromLast < 5.0) in onDrag to safely drop microscopic sub-pixel touch events while keeping the visual rendering loop instant.

Refactorings and Serialization Fixes

• Paint Serialization: Updated PaintConverter.dart and bumped SerializerVersion.PAINT_VERSION to ensure the user's Anti-aliasing preference is saved cleanly in .catrobat files while maintaining backwards compatibility.
• Cubic Serialization: Created a custom CubicToAction wrapper inside PathWithActionHistory and updated PathActionConverter.dart to support JSON serialization for 6-coordinate cubic Bezier splines.
• Memory Architecture Fix: Added a reset() method to PathWithActionHistory to support on-the-fly path reconstruction without triggering "ghost path" artifacts.
• Test Alignment: Updated Unit and Integration tests ( advanced_settings_state_data_test) to gracefully handle the new distance filters and default true states.

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