Add new compendium entries using bulk insert

[kernelmethod]

NewCompendiumEntryView (src/research_assistant/views/compendium_modification_views.py) adds new entries to the compendium one-by-one when uploading from BibTeX or JSON. In my experience, adding ~200 entries takes ~5 seconds or so to complete. We could make this a lot faster and more efficient using bulk inserts.