feat: Annotate Magnetometer

Author: ebariche

src/Uno.UI/LinkerDefinition.Wasm.xml

@@ -51,9 +51,6 @@
     <type fullname="Uno.Devices.Enumeration.Internal.Providers.Midi.MidiDeviceConnectionWatcher">
       <method name="DispatchStateChanged" />
     </type>
-	<type fullname="Windows.Devices.Sensors.Magnetometer">
-	  <method name="DispatchReading" />
-	</type>
     <type fullname="Windows.Networking.Connectivity.NetworkInformation">
 	  <method name="DispatchStatusChanged" />
 	</type>

src/Uno.UWP/Devices/Sensors/Magnetometer.wasm.cs

@@ -1,6 +1,7 @@
 #if __WASM__
 using System;
 using System.Diagnostics;
+using System.Diagnostics.CodeAnalysis;
 using Uno;
 using Uno.Devices.Sensors.Helpers;
 
@@ -12,6 +13,7 @@ public partial class Magnetometer
 
 		private DateTimeOffset _lastReading = DateTimeOffset.MinValue;
 
+		[DynamicDependency(nameof(DispatchReading))]
 		private Magnetometer()
 		{
 		}
@@ -52,7 +54,6 @@ private void StopReading()
 		/// <param name="y">Magnetic field Y</param>
 		/// <param name="z">Magnetic field Z</param>
 		/// <returns>0 - needed to bind method from WASM</returns>
-		[Preserve]
 		public static int DispatchReading(float x, float y, float z)
 		{
 			if (_instance == null)