Provide a TabControl like in WPF

### Description

I see that there is a TabPage but that would fill a complete screen. I'm looking for a tabbable interface that covers only a part of the screen and leaves a top (or bottom) space for general things.

### Public API Changes

```xml

Heading

...

```

### Intended Use-Case

For use in a GUI to provide alternate views (interpretations) of the same data.

Start by reviewing the existing TabPage implementation and the public XML API shown in the issue. Compare the requested partial-screen tabbed interface with the existing control behavior across MAUI targets. Done means a TabControl can host TabPage views within a Grid while leaving space for other content, with the documented API working across supported platforms.

Written by the indexing model from the issue text.