Provide a formalized mechanism with BindableObjects, so we can update the values but not trigger a handler update

[PureWeen]

Description

We're starting to see a number of scenarios where circular updates are causing performance issues.

https://github.com/dotnet/maui/pull/22347 https://github.com/dotnet/maui/pull/22413

You can see this pretty easily with any control that sends an update from platform code to xplat code.

For example, the radiobutton

• click the radiobutton
• radiobutton sets xplat value via (SetValue(IsCheckedProperty, true, specificity: SetterSpecificity.FromHandler);)
• this triggers OnPropertyChanged on the Element code

• this now propagates back down to the handler (Ideally this wouldn't happen)

Considerations

• Is there a SetValue Path we should make public to users?
• Is this something we should build into BindableObject? Shift all the code from Element.OnPropertyChanged up into BindableObject?

Related Issue

https://github.com/dotnet/maui/issues/5587

I'm curious if we can fix both of these issues with the same PR :-)

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• Shift Handler?.UpdateValue to happen after all PropertyChanged events have fired (#5587), similarity score: 0.70

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