[API Proposal]: Make IsApplePlatform public

[makazeu]

Background and motivation

When people want check if current application is running on Apple platforms, like macOS, iOS, watchOS, tvOS, they probably need to call OperatingSystem.IsMacOS() and OperatingSystem.IsIOS(), etc.

Perhaps we should provide a public method IsApplePlatform() .

We already have such internal method:

runtime/src/libraries/System.Private.CoreLib/src/System/OperatingSystem.cs

Lines 245 to 250 in 8a9d492

	internal static bool IsApplePlatform() =>
	#if TARGET_OSX || TARGET_MACCATALYST || TARGET_IOS || TARGET_TVOS
	true;
	#else
	false;
	#endif

API Proposal

        [NonVersionable]
        public static bool IsApplePlatform() =>
#if TARGET_OSX || TARGET_MACCATALYST || TARGET_IOS || TARGET_TVOS || TARGET_WATCHOS
            true;
#else
            false;
#endif

API Usage

if (OperatingSystem.IsApplePlatform()) 
{
     Console.WriteLine("Hello World from Cupertino, California");
}

Alternative Designs

No response

Risks

No response

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[kleisauke]

This could be useful to select the correct library extension (i.e. *.dylib) in a DllImportResolver callback. See for example commit kleisauke/net-vips@0fa851c.