[Experimental release] Adding ImageForegroundExtractor in AI features section

[palash-khare]

Description

Note: This feature will be available through experimental2 release.

Implementation of Image Foreground Extractor Feature
This PR adds a new Image Foreground Extractor feature to the Windows AI Sample application, demonstrating the use of the Windows API for automatic foreground object segmentation.

New Files Added:

[ImageForegroundExtractorModel.cs] - Model manager for handling ImageForegroundExtractor API operations
[ImageForegroundExtractorViewModel.cs]- ViewModel implementing the MVVM pattern for foreground extraction
[ImageForegroundExtractorPage.xaml & .xaml.cs ] - UI page for the foreground extraction demo
[ImageForegroundExtractor.md] - Code example demonstrating API usage
[ImageForegroundExtractorInit.md] - Initialization code example

Modified Files:

[MainWindow.xaml & .xaml.cs] - Added navigation item for the new feature
[CopilotRootViewModel.cs] - Integrated the new ViewModel into the app's navigation structure

Testing

Tested out with 2.0.0-experimental2 custom Nuget. All of the APIs required for E2E flow working as expected.

Target Release

experimental2 release

Checklist

Note that /azp run currently isn't working for this repo.

• Samples build and run using the Visual Studio versions listed in the Windows development docs.
• Samples build and run on all supported platforms (x64, x86, ARM64) and configurations (Debug, Release). - Only applicable for x64 and arm64
• Samples set the minimum supported OS version to Windows 10 version 1809.
• Samples build clean with no warnings or errors.
• [For new samples]: Samples have completed the sample guidelines checklist and follow standardization/naming guidelines.
• Microsoft employees only: you can validate your changes by following the instructions here: https://www.osgwiki.com/wiki/WindowsAppSDK-Samples

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