BpmnXMLUtil.parseExtensionElement setElementText has bug of Line wrap cover

**Describe the bug**
当 extensionElements 元素 text中存在换行时 xtr.next(); 方法会导致数据被覆盖
When there is a line break in the extensionElements element text, xtr. text(); Method can cause data to be overwritten
**Expected behavior**
A clear and concise description of what you expected to happen.

**Code**
while (!readyWithExtensionElement && xtr.hasNext()) {
xtr.next();
if (xtr.isCharacters() || XMLStreamReader.CDATA == xtr.getEventType()) {
if (StringUtils.isNotEmpty(xtr.getText().trim())) {
//fix set to append
extensionElement.setElementText(xtr.getText().trim());
}
} else if (xtr.isStartElement()) {
ExtensionElement childExtensionElement = parseExtensionElement(xtr);
extensionElement.addChildElement(childExtensionElement);
} else if (xtr.isEndElement() && extensionElement.getName().equalsIgnoreCase(xtr.getLocalName())) {
readyWithExtensionElement = true;
}
}