Adapt MIT Press ingestion script to use our library

[mbollmann]

This PR demonstrates how an ingestion script could be adapted to use the Python library.

NOTE: This branch was forked from https://github.com/acl-org/acl-anthology/tree/python-minimal-diff-xml-saving, so the commit history is currently quite noisy, and this shouldn't be merged before #5337 is.

• Commit 2b82771 contains the functional changes to the ingestion script.
  • To just view the new script: https://github.com/acl-org/acl-anthology/blob/2b82771bd5da1272cc32006d9843a2171e8166c5/bin/ingest_mitpress.py
• I tested the script with the 2024 Vol.4 ingestion data that David provided to me.
• The only part of the ingestion pipeline that is currently not integrated in the new library is https://github.com/acl-org/acl-anthology/tree/master/bin/fixedcase. We can discuss if it should be, but that appeared non-trivial to do, so I held off on it for now.
• Since the ingestion script had (wrong) type annotations, I tried to run it through mypy and fix it, but it's actually quite ugly to do since lxml.etree can often return None or Any, and we never check for this. See cc1d452 for a first attempt. We might just ignore this for now.

[codecov]

Codecov Report

Attention: Patch coverage is 98.29060% with 2 lines in your changes missing coverage. Please review.

Project coverage is 93.75%. Comparing base (9302755) to head (cc1d452).

Files with missing lines	Patch %	Lines
python/acl_anthology/collections/event.py	92.85%	1 Missing ⚠️
python/acl_anthology/utils/xml.py	98.24%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##           python-dev    #5359      +/-   ##
==============================================
+ Coverage       93.67%   93.75%   +0.08%     
==============================================
  Files              35       35              
  Lines            2781     2850      +69     
==============================================
+ Hits             2605     2672      +67     
- Misses            176      178       +2     

Files with missing lines	Coverage Δ
python/acl_anthology/collections/__init__.py	100.00% <100.00%> (ø)
python/acl_anthology/collections/collection.py	97.61% <100.00%> (+0.89%)	⬆️
python/acl_anthology/collections/eventindex.py	92.95% <100.00%> (-0.20%)	⬇️
python/acl_anthology/collections/paper.py	92.41% <100.00%> (+0.10%)	⬆️
python/acl_anthology/collections/types.py	100.00% <100.00%> (ø)
python/acl_anthology/people/name.py	97.81% <100.00%> (-0.73%)	⬇️
python/acl_anthology/sigs.py	97.02% <100.00%> (ø)
python/acl_anthology/utils/git.py	76.27% <100.00%> (-6.78%)	⬇️
python/acl_anthology/venues.py	88.40% <100.00%> (ø)
python/acl_anthology/collections/event.py	99.20% <92.85%> (-0.80%)	⬇️
... and 1 more

... and 1 file with indirect coverage changes

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[mbollmann]

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