user can now select which summarizer to use

...ents-text-summarization-frontend/src/collection_editor.js

...s-events-text-summarization-frontend/src/database_util.js

summarizer_implementations/__pycache__/bert.cpython-312.pyc

summarizer_implementations/__pycache__/nltk.cpython-312.pyc

...plementations/__pycache__/nltk_summarizer.cpython-312.pyc

summarizer_implementations/__pycache__/t5.cpython-312.pyc

summarizer_implementations/bert.py