New CaltechAUTHORS functionality and bug fixes

What's Changed

• Changes get_author_records function definition to make the token optional and switches to using the full date
• Adds author affiliation automation for CaltechAUTHORS
• Added new function for updating DOIs in CaltechAUTHORS
• Adds new function to get series from CaltechAUTHORS
• Re-enables DOI validation on datacite harvester
• Adds backend functions for automated crosslinking for CaltechDATA and CaltechAUTHORS

New Contributors

• @elizabethjhwon made their first contribution in #20
• @RohanBhattaraiNP made their first contribution in #22

Full Changelog: v1.1.4...v1.2.0