[Feature Request]: Submenus for Long COMBO lists

### Is there an existing issue for this?

- [X] I have searched the existing issues and checked the recent builds/commits

### What would your feature do ?

Add a meta attr to a field that would allow the combobox list to be turned into a sublist of items:


### Proposed workflow

`"FIELD": ("COMBO_LIST_OF_STUFFS", {})`
==>
`"FIELD": ("COMBO_LIST_OF_STUFFS", {"compact": True})`

Compact could also be used as a general attribute representing a collapsed/compacted display of the field with an exposure to allow the node authors to "re-organize" said display how they wanted.

For the FL node above, it was based on the reference from pythongosssss existing solution:

https://github.com/pythongosssss/ComfyUI-Custom-Scripts/blob/main/web/js/betterCombos.js

### Additional information

_No response_