Bug in xmlparser.py for time format %Y-%m-%dT%H:%M:%S%z

[prrw]

Describe the bug

xmlparser.py cannot parse PublicationDate if it is not given in different format than %Y-%m-%dT%H:%M:%SZ.
Format with UTC Offset for example 2023-05-31T10:45:30+02:00 is also valid and leads to error while importing the nodeset.

To Reproduce

Import an xml with PublicationDate in UTC offset format eg. 2023-05-31T10:45:30+02:00

await self.import_xml("xyz.xml")

Expected behavior

xmlparser will throw an error saying the format does not match

Screenshots

Version

Python-Version: 3.7.0
opcua-asyncio Version: 1.0.2

Possible solution

A possible solution exists and can be added with pull request after discussion.

                if date_time is None:
                    date_time = ua.DateTime(1, 1, 1)
                elif date_time and date_time[-1]=="Z":
                    date_time = ua.DateTime.strptime(date_time, "%Y-%m-%dT%H:%M:%SZ")
                else:
                    date_time = ua.DateTime.strptime(date_time, "%Y-%m-%dT%H:%M:%S%z")