Add Eflomal word alignment model

[ddaspit]

This change is 

[codecov-commenter]

Codecov Report

❌ Patch coverage is 95.36082% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.76%. Comparing base (47af1ff) to head (a67348e).

Files with missing lines	Patch %	Lines
...nslation/thot/thot_word_alignment_model_trainer.py	80.00%	8 Missing ⚠️
...nslation/thot/thot_eflomal_word_alignment_model.py	93.75%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #321      +/-   ##
==========================================
+ Coverage   91.70%   91.76%   +0.06%     
==========================================
  Files         359      362       +3     
  Lines       23480    23623     +143     
==========================================
+ Hits        21532    21678     +146     
+ Misses       1948     1945       -3     

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[Enkidu93]

@Enkidu93 reviewed 12 files and all commit messages, and made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on ddaspit).