Add IsIndeterminate to AppNotificationProgressData

Describe the bug

With the AppNotificationProgressData API, developers cannot set value="indeterminate" to their progress bar toast notification. In XML, setting value="indeterminate" in the progress element creates a loading animation in the progress bar notification. However, this behavior cannot be achieved with the current AppNotificationProgressData API.

Proposed solution: add a boolean isIndeterminate, very similar to the WCT notification library's builder syntax approach, to AppNotificationProgressData. Bool isIndeterminate would get or set a value indicating whether the progress bar is indeterminate. If isIndeterminate is true, Value will be ignored.

Steps to reproduce the bug

Existing XML notification functionality is not supported in latest API

Expected behavior

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Screenshots

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NuGet package version

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Packaging type

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Windows version

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IDE

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Additional context

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