[iOS] Investigate if MauiCALayer needs to use a weakreference for the IShape

[PureWeen]

Description

We should confirm this a bit more

		[UnconditionalSuppressMessage("Memory", "MEM0002", Justification = "IShape is a non-NSObject in MAUI.")]
		IShape? _shape;

You might get some shapes that inherit from View and those will have Handlers and NSObjects associated with them

public sealed partial class RoundRectangle : Shape, IShape, IRoundRectangle

Reproduction

Haven't been ablet to reproduce as of yet.
From what I can tell everything is collecting without any issues.

I've just seen some signs of lingering in larger apps but still need to narrow down if this is a culprit