Show frequently used apps in some way

### Problem

Our stance in the past has always been that frequently used apps should be pinned to the dock so we don't need to do anything about this in the applications menu. However, in our recent UI study *90% of users reported that they use the applications menu to launch frequently used apps at least sometimes* https://blog.elementary.io/2021-ui-study-results-dock-multitasking/

### Proposal

We should probably consider whether it's worth making it easier to get to frequently used apps in the applications menu with a special category or section

### Prior Art (Optional)

_No response_