Custom Classical Data Grid Plugin Development

Create New Custom Plugin named as Classical Data Grid, similar to Perspective (Finos) Data Grid Plugin (Github repositories : https://github.com/finos/perspective.git) with classical pivot features.

All features of ClassicalDataGrid with following custom facilties:
1. Classical Pivot Format (Similar to Excel Classical Pivot Layout), Row Header side by side instead of tree Structure Grouping
2. All row headers grouping Column with Expand/Collapse facility at each level with repeated label true/false facility
3. Same display structure Export as CSV or xlsx.
4. Subtotal hide/unhide features.
5. Keep remaining all UI features as it is similar to Data Grid except above.


Deadline: Delivery expected within 7 days.