Capture doctype dataset for DataCite

[ehenneken]

The datacite.py parser will now have a value dataset for the doctype attribute in the output of the parser. This is to support capturing the proper doctype in the Ingest Parser for dataset records harvested from Zenodo/DataCite

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.47%. Comparing base (6770d18) to head (f73e87b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #180   +/-   ##
=======================================
  Coverage   91.47%   91.47%           
=======================================
  Files          27       27           
  Lines        3224     3224           
=======================================
  Hits         2949     2949           
  Misses        275      275           

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