Syncfusion Flutter UI Widgets

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1. Introduced a new Chat widget.
2. Implemented support for border radius, width, and spacing in the Candle Chart.
3. Added individual axis range padding options (additional, round) for the Numeric, DateTime axes.
4. Enabled individual plot offset support for all Chart axes.
5. Added sticky note annotation functionality in the PDF Viewer.
6. Upgraded all widgets to the latest version of Flutter SDK 3.24.
7. Bug fixes.