feat(serialize-xml): Add NativeXmlReader.copyTo

commons-serialize-xml/src/main/java/io/gitlab/jfronny/commons/serialize/xml/NativeXmlReader.java

@@ -822,4 +822,33 @@ public class NativeXmlReader implements Closeable {
         stackSize = 1;
         in.close();
     }
+
+    /**
+     * Copies the current element to the writer.
+     *
+     * @param writer the writer to copy to
+     * @throws IOException if an error occurs
+     */
+    public void copyTo(NativeXmlWriter writer) throws IOException {
+        switch (peek()) {
+            case BEGIN_TAG -> {
+                beginTag();
+                writer.beginTag(pathNames[stackSize - 1]);
+                while (hasNext()) {
+                    copyTo(writer);
+                }
+                endTag();
+                writer.endTag();
+            }
+            case END_TAG -> throw new IllegalStateException("Cannot copy standalone END_TAG");
+            case TEXT -> writer.text(nextText());
+            case CDATA -> writer.cdata(nextCData());
+            case ATTRIBUTE_NAME -> {
+                String name = nextAttributeName();
+                writer.attribute(name, nextAttributeValue());
+            }
+            case ATTRIBUTE_VALUE -> writer.attributeValue(nextAttributeValue());
+            case EOF -> throw new IllegalStateException("Cannot copy END_DOCUMENT");
+        }
+    }
 }