Support button element for info_text field type in settings

- This allows the info_text field to display a button element. Button element is used for Stripe's Connect/Disconnect functionality. The issue with anchor tag, it requires to deattach the onclick function before you can disable it. With button, you only need to add a disabled attribute to prevent the js function from triggering

includes/admin/core/class-admin-forms.php

@@ -125,6 +125,9 @@ if ( ! class_exists( 'um\admin\core\Admin_Forms' ) ) {
 							'target' => array(),
 							'class' => array(),
 						),
+						'button' => array(
+							'class' => array(),
+						),
 						'i' => array(
 							'class' => array(),
 						),