Row and Column grouping for your Reactive Table

Steps:
1. Create your table using accelerator or manual
2. Add widget ReactiveTableGroup
3. Move Table element inside ReactiveTableGroup placeholder
4. For column grouping, add attribute group-label in Header Cell

5. For row data grouping, add attribute data-id in Row Cell.
This data-id should be unique, and include parent key (see example in below screenshot)
For row data grouping, make sure your aggregate's sort is supporting the grouping (fixed sort, not dynamic sort), see the example in demo module.