SplitView Component

- Add new SplitView component

Params:
- Color
- DividerBackgroundColor
- DividerDraggingBackgroundColor
- DividerHoverBackgroundColor
- IsDisabled
- MinimumPaneSize
- OnResizeEnded
- OnResized
- OnResizeStarted
- Orientation: Default: Horizontal, Vertical
- Pane1
- Pane2
- PrimaryPaneSize
- PrimaryPaneSizeChanged