Sample code to demonstrate how to encode and decode Base64 images in .NET MAUI

sample is extended to demonstrate that multiple imagestreams are not correctly handeld by maui. errors are not predictable, but they do appear randomly Error is fatal and can not be handeld in the project code.

based on gerald versluis sample: https://blog.verslu.is/maui/displaying-base64-encoded-images-dotnet-maui/