update/improve module docstrings + add copyright notices
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This MR improves the docstring of aas.adapter._generic and updates the docstring of aas.model.aas.
The docstring of aas.adapter._generic is still quite short, but I think it contains all information that is necessary to understand what the module does / what its use is.
So this closes issues #61 (closed) and #62 (closed).
Additionally this MR adds missing copyright notices to:
aas.adapter._genericaas.model.concepttest._helper.setup_testdb