kapp controller GUI

**Describe the problem/challenge you have**
Currently should one want to do somewhat trivial package install/app management of their clusters they have to do so on the CLI. This creates a level of friction that isn't desirable for many operators as they'd prefer to be able to imperatively make changes.

At some scale those imperative changes become quite impractical, but if for no other reason than it's a key consumption/devX problem with kapp controller as it stands.

Not to mention it's difficult to visualize what kapp-controller is doing today since there is no GUI to actually see changes as they are happening and what resources are kapp-controller managed.

**Describe the solution you'd like**
Maybe a backstage plugin to manage kapp controller resources

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