This is port of internal fix which adds Confirmation of Action feature to many actions in WinUI gallery #1245
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(Since this code has already been added to internal WinUI gallery and this is just a port, I will just go ahead and merge it.)
Confirmation of Action is an accessibility feature where visual changes are notified to the impaired user using audio notification like Narrator. The common actions where it can be used when a visual is changing color or app theme is changing from light to dark or vice versa.
This PR introduces a AnnounceActionForAccessibility helper function which helps create this contextual announcement. This announcement is used by Narrator to inform the user that a large visual change has happened like scale/rotate of an object.
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