Add placeholders for Extension/Layout functionality

[zackkatz]

Users may not know that additional functionality exists, like improved filtering with Advanced Filtering and Maps/DataTables layouts.

These are the scenarios to cover:

• [ ] Installed but not activated ("Activate")
• [ ] Not installed, but license has access ("Install & Activate")
• [ ] Not installed, and no license/license doesn't support the feature ("Buy Now - ${$price}")

(Transferred from https://github.com/GravityKit/Advanced-Filter/issues/136)

Sometimes users install the Advanced Filter extension but don't know that they have to activate it, so perhaps we put a link on the View Settings:

Here are the Figma designs (note: this is the wrong extension icon!) https://www.figma.com/file/OM63Lq6eIlzu3nFPR4Xro8/GravityKit-UI%2FUX?type=design&node-id=2045-179&mode=design