[3.1] feat(extensible-area): add apps gallery extensible area #149
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What does this PR do?
Until now, the only way to add an item in the apps gallery was by injecting a sidekick generic content. But as the concept of apps
expanded beyond sidebar contents, it was necessary to decouple the gallery apps from the sidebar content(i.e. generic sidekick content). So this PR adds an extensible area specifically for the apps gallery. It has only one type, which is 'ENTRY' and corresponds to an apps gallery entry that won't open a sidebar content when clicked.
Also adds a sample plugin for the new apps gallery extensible area:
Core PR: