CoreML watchOS xcode15.0 b3

#CoreML.framework https://github.com/xamarin/xamarin-macios/pull/18898

diff -ruN /Applications/Xcode_15.0.0-beta2.app/Contents/Developer/Platforms/WatchOS.platform/Developer/SDKs/WatchOS.sdk/System/Library/Frameworks/CoreML.framework/Headers/MLNeuralEngineComputeDevice.h /Applications/Xcode_15.0.0-beta3.app/Contents/Developer/Platforms/WatchOS.platform/Developer/SDKs/WatchOS.sdk/System/Library/Frameworks/CoreML.framework/Headers/MLNeuralEngineComputeDevice.h
--- /Applications/Xcode_15.0.0-beta2.app/Contents/Developer/Platforms/WatchOS.platform/Developer/SDKs/WatchOS.sdk/System/Library/Frameworks/CoreML.framework/Headers/MLNeuralEngineComputeDevice.h	2023-06-10 05:29:28
+++ /Applications/Xcode_15.0.0-beta3.app/Contents/Developer/Platforms/WatchOS.platform/Developer/SDKs/WatchOS.sdk/System/Library/Frameworks/CoreML.framework/Headers/MLNeuralEngineComputeDevice.h	2023-06-27 07:31:06
@@ -20,4 +20,7 @@
 
 + (instancetype)new NS_UNAVAILABLE;
 
+/// The total number of cores in the NeuralEngine.
+@property (readonly, assign, nonatomic) NSInteger totalCoreCount;
+
 @end