Consider adding support for Configuration when groupedColumnMode is set to 'remove'

[chrisBas]

Hi, I am not sure where to add this proposal; but I figured here might be a good start, please let me know if this is not the correct place.

I was looking to add some customization to the table when i set the groupedColumnMode to 'remove' and found that the customization is limited for this feature and was looking to propose an enhancement with the following two features:

• Add a configuration to overwrite the aggregation column width when the table is configured with groupedColumnMode='remove'. Currently, this will always be set to either the defaultColumn.size value or 180 as shown in the code
• Add a configuration to overwrite the aggregation column header when the table is configured with groupedColumnMode='remove'. Currently, this will always be set to initialState.grouping.join(", ") as shown in the code

FYI: I opened this issue but then I immediately closed it because "Discussions" seemed like a better place...