Fix iOS Simulator performance with Metal

[taublast]

This comes from a new synced branch.

Had iOS simulator lagging on M1 at 9 fps with SKGLView, so had to adjust its platform-related code for iOS to unlock 60 fps.
Just followed Apple guidelines for simulator: https://developer.apple.com/documentation/metal/developing-metal-apps-that-run-in-simulator?language=objc

replacing SampleCount = 1; (no MSAA) inside SKMetalView with:

			if (DeviceInfo.Current.DeviceType == DeviceType.Virtual)
			{
				DepthStencilStorageMode = MTLStorageMode.Private;
				SampleCount = 4;
			}
			else
			{
				DepthStencilStorageMode = MTLStorageMode.Shared;
				SampleCount = 2;
			}

Works fine in DrawnUi now, wanted to share.

[mattleibow]

/rebase

[mattleibow]

/azp run

[azure-pipelines]

Azure Pipelines could not run because the pipeline triggers exclude this branch/path.

[mattleibow]

Thanks for this PR and catching this special case!

The DeviceInfo type is a .NET MAUI Essentials type and can't be used here, but we can copy the implementation:

bool IsSimulator =>
#if __MACCATALYST__ || __MACOS__
    false;
#else
    ObjCRuntime.Runtime.Arch == Arch.SIMULATOR;
#endif

And then use this as part of the if.

[taublast]

Catalyst has same settings as iOS here, MacOS+Simulator have them different

[taublast]

yay lets go