feat: implement DeesDashboardgrid component with drag-and-drop functionality

- Added DeesDashboardgrid class for managing a grid of dashboard widgets.
- Implemented widget dragging and resizing capabilities.
- Introduced layout management with collision detection and margin resolution.
- Created styles for grid layout, widget appearance, and animations.
- Added support for customizable margins, cell height, and grid lines.
- Included methods for adding, removing, and updating widgets dynamically.
- Implemented context menu for widget actions and keyboard navigation support.
- Established a responsive design with breakpoint handling for different layouts.

ts_web/elements/dees-dashboardgrid/index.ts

@@ -0,0 +1,2 @@
+export * from './dees-dashboardgrid.js';
+export * from './types.js';