Gisco-geodata

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- Nothing changed yet.

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- bugfix: parameter year was not passed to self.get_units() for all themes

- XML metadata can be read directly as an xml.etree.ElementTree object

- Added an asyncio.run wrapper. See https://stackoverflow.com/questions/55409641/asyncio-run-cannot-be-called-from-a-running-event-loop-when-using-jupyter-no. gisco-geodata would raise errors if there was already an event loop running (e.g. when using gisco-geodata with jupyter notebook)

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- implemented an async retry decorator for async functions and a sync retry decorator for sync functions acf8da3

- removed the add_note calls to exceptions because they are only available in python >= 3.11 as per PEP 678

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