perf: Add DispatchMessage export

src/Uno.UI/ts/Windows/Devices/Midi/MidiInPort.ts

@@ -27,8 +27,12 @@
 
 		public static startMessageListener(managedId: string) {
 			if (!MidiInPort.dispatchMessage) {
-				MidiInPort.dispatchMessage = (<any>Module).mono_bind_static_method(
-					"[Uno] Windows.Devices.Midi.MidiInPort:DispatchMessage");
+				if ((<any>globalThis).DotnetExports !== undefined) {
+					MidiInPort.dispatchMessage = (<any>globalThis).DotnetExports.Uno.Windows.Devices.Midi.MidiInPort.DispatchMessage;
+				} else {
+					MidiInPort.dispatchMessage = (<any>Module).mono_bind_static_method(
+						"[Uno] Windows.Devices.Midi.MidiInPort:DispatchMessage");
+				}
 			}
 
 			const instance = MidiInPort.instanceMap[managedId];

src/Uno.UWP/Devices/Midi/MidiInPort.wasm.cs

@@ -12,6 +12,8 @@ using Uno.Devices.Midi.Internal;
 using Uno.Foundation;
 
 #if NET7_0_OR_GREATER
+using System.Runtime.InteropServices.JavaScript;
+
 using NativeMethods = __Windows.Devices.Midi.MidiInPort.NativeMethods;
 #endif
 
@@ -58,6 +60,9 @@ namespace Windows.Devices.Midi
 #endif
 		}
 
+#if NET7_0_OR_GREATER
+		[JSExport]
+#endif
 		public static int DispatchMessage(string managedId, string serializedMessage, double timestamp)
 		{
 #if DEBUG