svgom: add the SVGDiscardElement interface

Note: the W3C software-license-2023 is identified by SPDX W3C-20150513, see

spdx/license-list-XML#2600 (comment)

Author: carlosame

svgom-api/src/main/java/org/w3c/dom/svg/SVGDiscardElement.java

@@ -0,0 +1,15 @@
+/*
+ * Copyright © 2023 W3C®.
+ * 
+ * This software or document includes material copied from or derived from
+ * https://svgwg.org/specs/animations/
+ *
+ * [1] https://www.w3.org/copyright/software-license-2023/
+ */
+
+// SPDX-License-Identifier: W3C-20150513
+
+package org.w3c.dom.svg;
+
+public interface SVGDiscardElement extends SVGAnimationElement {
+}