Add negating filter operators e.g "is not empty", "does not contain..."

[Logianer]

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

I want to have a Table view where i can filter for every Row that has every possible value in a "selection-field" except a specific one. That's where a "is-not" filter would be handy.

Describe the solution you'd like

The best solution is to have a filter operator that is the opposite of "is-equal". It would return all entries that have

Describe alternatives you've considered

The current way is to have an "is-equal" chain (when using a selection-field) and connecting all options using "OR" (except the one, that should not appear). This easily gets complicated and is heavy on resources.

Additional context

I would really work on this feature, i looked into the filtering but still have no idea where the filtering actually happens (I found the filter definitions but nothing else)...Does it happen in the DBController or on the client-side?