feat(ui5-checkbox): implement required property (#5055)

Fixes: #4895

Author: nnaydenow

packages/main/src/CheckBox.hbs

@@ -7,6 +7,7 @@
 	aria-label="{{ariaLabelText}}"
 	aria-labelledby="{{ariaLabelledBy}}"
 	aria-describedby="{{ariaDescribedBy}}"
+	aria-required="{{required}}"
 	tabindex="{{tabIndex}}"
 	@mousedown="{{_onmousedown}}"
 	@mouseup="{{_onmouseup}}"

packages/main/src/CheckBox.js

@@ -84,6 +84,18 @@ const metadata = {
 			type: Boolean,
 		},
 
+		/**
+		 * Defines whether the component is required.
+		 *
+		 * @type {boolean}
+		 * @defaultvalue false
+		 * @public
+		 * @since 1.3.0
+		 */
+		required: {
+			type: Boolean,
+		},
+
 		/**
 		* Defines whether the component is displayed as partially checked.
 		* <br><br>