feat(BadgeNotification): Support for WASM

Author: MartinZikmund

src/Uno.UI/WasmScripts/Uno.UI.d.ts

@@ -1153,6 +1153,16 @@ declare namespace Windows.UI.Core {
         private clearStack;
     }
 }
+interface Navigator {
+    setAppBadge(value: number): void;
+    clearAppBadge(): void;
+}
+declare namespace Windows.UI.Notifications {
+    class BadgeUpdater {
+        static setNumber(value: number): void;
+        static clear(): void;
+    }
+}
 declare namespace Windows.UI.ViewManagement {
     class ApplicationView {
         static setFullScreenMode(turnOn: boolean): boolean;

src/Uno.UI/ts/Windows/UI/Notifications/BadgeUpdater.ts

@@ -0,0 +1,24 @@
+interface Navigator {
+	setAppBadge(value: number):void;
+	clearAppBadge(): void;
+}
+
+namespace Windows.UI.Notifications {
+
+	export class BadgeUpdater {
+
+		public static setNumber(value: number) {
+			if (navigator.setAppBadge) {
+				navigator.setAppBadge(value);
+			}
+		}
+
+		public static clear() {
+			if (navigator.clearAppBadge) {
+				navigator.clearAppBadge();
+			}
+		}
+
+	}
+
+}

src/Uno.UWP/UI/Notifications/BadgeUpdater.wasm.cs

@@ -1,11 +1,23 @@
 #nullable enable
 
+using Uno.Foundation;
+
 namespace Windows.UI.Notifications
 {
 	public partial class BadgeUpdater
 	{
+		private const string JsType = "Windows.UI.Notifications.BadgeUpdater";
+
 		partial void SetBadge(string? value)
 		{
+			if (value != null && int.TryParse(value, out var number))
+			{
+				WebAssemblyRuntime.InvokeJS($"{JsType}.setNumber({number})");
+			}
+			else
+			{
+				WebAssemblyRuntime.InvokeJS($"{JsType}.clear()");
+			}
 		}
 	}
 }