Support xml attributes

[skjnldsv]

Xml example

<?xml version="1.0"?>
<d:multistatus
	xmlns:d="DAV:"
	xmlns:s="http://sabredav.org/ns"
	xmlns:oc="http://owncloud.org/ns"
	xmlns:nc="http://nextcloud.org/ns">
<d:response>
		<d:href>/remote.php/dav/files/admin/benjamin-lehman-xnTcEJm5IZw-unsplash.jpg</d:href>
		<d:propstat>
			<d:prop>
				<nc:system-tags>
					<nc:system-tag oc:can-assign="true" oc:id="321" oc:user-assignable="true" oc:user-visible="true">Test</nc:system-tag>
				</nc:system-tags>
			</d:prop>
			<d:status>HTTP/1.1 200 OK</d:status>
		</d:propstat>
	</d:response>
</d:multistatus>

Issue

Currently, the fast-xml-parser ignore attributes.
A quick test, passing the following options would allow us to retrive the attributes like so

        attributeNamePrefix: "",
        ignoreAttributes: false,
        textNodeName: "text",

I think adding a proper method to process those would be best, so we can keep the namespaces and avoid conflicts?

[skjnldsv]

PR incoming