Add forced update of ScrollView on iOS

[cat0363]

This PR resolves the issue where the Expander tap does not work when the Expander is placed outside the display range of the ScrollView.

Description of Change

Fixed to call InvalidateMeasure method if element.Parent is ScrollView.

[src\CommunityToolkit.Maui\Views\Expander\Expander.shared.cs]

void ResizeExpanderInItemsView(TappedEventArgs tappedEventArgs)
{
    if (Header is null)
    {
        return;
    }

    Element element = this;
    var size = IsExpanded
        ? Measure(double.PositiveInfinity, double.PositiveInfinity, MeasureFlags.IncludeMargins).Request
        : Header.Measure(double.PositiveInfinity, double.PositiveInfinity);

    while (element is not null)
    {
        if (element.Parent is ListView && element is Cell cell)
        {
#if IOS || MACCATALYST
            throw new NotSupportedException($"{nameof(Expander)} is not yet supported in {nameof(ListView)}");
#else
            cell.ForceUpdateSize();
#endif
        }
#if IOS || MACCATALYST || WINDOWS
        else if (element is CollectionView collectionView)
        {
            var tapLocation = tappedEventArgs.GetPosition(collectionView);
            ForceUpdateCellSize(collectionView, size, tapLocation);
        }
#endif
#if IOS || MACCATALYST
        else if (element is ScrollView scrollView)
        {
            (scrollView as IView).InvalidateMeasure();
        }
#endif

        element = element.Parent;
    }
}

Linked Issues

• Fixes [BUG] Expander in scrollview does not expand on IOS #1439

PR Checklist

• Has a linked Issue, and the Issue has been approved(bug) or Championed (feature/proposal)
• Has tests (if omitted, state reason in description)
• Has samples (if omitted, state reason in description)
• Rebased on top of main at time of PR
• Changes adhere to coding standard
• Documentation created or updated: https://github.com/MicrosoftDocs/CommunityToolkit/pull/XYZ

Additional information

Below are the verification results.

iPhone.14.iOS.16.4.2023-10-04.16-35-35.mp4

You can see that the Expander placed outside the visible range of the ScrollView is working.

[cat0363]

Additional Information:
If Issue #1439 is a similar issue to Issue #14257, this PR is a temporary workaround until a solution for Issue #14257 is released.