Support different sizes of text and text/icon view options, in new App Menu

[ninavizz]

This is a child issue within the epic #6665

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The problem you're addressing (if any)
Many respondents to the survey from #6573 expressed a desire for user-controlled text sizing, in the new App Menu. Many of the folks requesting this feature, further elaborated—the majority, citing accessibility needs. Others, just want the most compact/dense view they can get.

In the first survey we ran back in 2020, we also got many users responding that they use screen magnification software. I will update this Issue at a later date, to quantify all of the above with proper data.

Describe the solution you'd like
A tee-shirt sizing (Small, Medium, Large) approach, that also scales icon sizes—and including vs not including icons—line and letter spacing, along with the actual font sizes.

A different approach, would be the +/- ticker control approach present in many applications and websites as a standardized accessibility enhancement. Because of the complexity of the layouts and information in the app menu, I believe the tee-shirt sizing approach would be better—and much easier to implement, elegantly.

Whichever solution we go with, I also propose to be managed by #6668 and not contextually in the AppMenu itself. Unless the latter can itself, be elegantly resolved.

Where is the value to a user, and who might that user be?
Vision impaired users, users who prefer information-dense views, and users with odd display setups.

Describe alternatives you've considered
Not caring.
I'd rather care.

Additional context
Future enhancement to #5677