[iOS] Fixed ImageButton not honoring Padding value.

[NirmalKumarYuvaraj]

Issue Details

The ImageButton size calculation is incorrect. When an ImageButton has both padding and an image, its measured size does not adapt to include the padding values, causing the image to render smaller than expected.

Root Cause

The ImageButton DesiredSize is determined solely based on the ImageSize during the SizeThatFitsImage calculation. As a result, the ImageButton renders according to the image size alone, without accounting for the padding values in its measurement.

Description of Change

Updated the ImageButton to implement ICrossPlatformLayout for handling measurements, ensuring that content measurement accounts for padding values as expected, thereby improving the layout behavior.

Tested the behaviour in the following platforms

• Android
• Windows
• iOS
• Mac

Issue Fixed

Fixes #22521

Output

Before	After

[dotnet-policy-service]

Hey there @NirmalKumarYuvaraj! Thank you so much for your PR! Someone from the team will get assigned to your PR shortly and we'll get it reviewed.