[Feature] Flow Direction demos for the sample app

[Avid29]

Describe the problem

Proper right to left behavior isn't always clear. Toolkit maintainers likely don't test their controls in RTL flowing languages and developers writing with RTL flowing languages in mind don't always know the proper behavior.

Adding a Flow Direction option next to theme in the SampleController would at least allow Toolkit maintainers to easily test the behaviors of the controls more easily, and developers using the toolkit to more easily check the behavior of these controls in that context.

Describe the solution

I have added a Flow Direction ComboBox next to the theme ComboBox that changes the flow direction in the demo area.

Alternatives

Enter FlowDirection="RightToLeft" in the root element of the XAML page

Additional info

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[ghost]

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