add TYPE property to UmbContextToken to get the generic type

src/Umbraco.Web.UI.Client/libs/context-api/context-token.ts

@@ -1,4 +1,15 @@
 export class UmbContextToken<T = unknown> {
+	/**
+	 * Get the type of the token
+	 *
+	 * @public
+	 * @type      {T}
+	 * @memberOf  UmbContextToken
+	 * @example   `typeof MyToken.TYPE`
+	 * @returns   undefined
+	 */
+	readonly TYPE: T = undefined as never;
+
 	/**
 	 * @param alias   Unique identifier for the token,
 	 * @param _desc   Description for the token,
@@ -7,13 +18,6 @@ export class UmbContextToken<T = unknown> {
 	 */
 	constructor(protected alias: string, protected _desc?: string) {}
 
-	/**
-	 * @internal
-	 */
-	get multi(): UmbContextToken<Array<T>> {
-		return this as UmbContextToken<Array<T>>;
-	}
-
 	/**
 	 * This method must always return the unique alias of the token since that
 	 * will be used to look up the token in the injector.