MITLibraries / dspace-submission-composer / 13509269626

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Add some flexibility to the SimpleCSV workflow

Why these changes are being introduced:
* Rework SimpleCSV methods to better handle modest variations
in provided metadata CSV files (field names) and
bitstreams (filenames).

How this addresses that need:
* Allow multiple 'source_field_name' values for 'item_identifier' metadata mapping
* Update SCCS metadata mapping JSON file to accept 'filename' as 'item_identifier'
* Rework SimpleCSV reconcile methods to match metadata and bitstreams
based on presence of item identifier in bitstream filename;
remove code to retrieve item identifiers from bitstream filenames;
for bitstreams without metadata, indicate filenames instead
* Use pandas to read metadata CSV file

Side effects of this change:
* The column in the metadata CSV file that contains the item identifier
can take on any name as long as it is listed in the 'source_field_name'
for the 'item_identifier' entry in the metadata mapping JSON file.

Relevant ticket(s):
* https://mitlibraries.atlassian.net/browse/IN-1186

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