[FEATURE] - Add Mod Category Grouping within the ModFolder

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Is your feature request related to a problem? Please describe.

As a user I would like to see the Mod folder list of mods groups by their defined in the .xml. The categories should be able to collapse and expand. This feature could also be able to be turned off if the user doesn't want that view. The search & filter actions should still show the mods as they do today, no need to show based on the category. The Mod list sorting can stay the way that it currently is.

### Describe the solution you'd like

Grouped by Category:

(-) ModFolder
(-) Small Tractors (shown as expanded)
Mod_Small_Tractor01
Mod_Small_Tractor02
(-) Medium Tractors
Mod_Med_Tractor01
etc...
(+) Large Tractors (shown as collapsed)
(+) Harvesters

This would allow for more organization and it will tie like mods together and not have to hunt as much when you don't know the name or filename of the mod.

### Anything else?

_No response_