Updated DocumentTermMatrix implementation

[svilupp]

• Improved the performance of BM25/Keywords-based indices for >10M documents. Introduced new kwargs of min_term_freq and max_terms in RT.get_keywords to reduce the size of the vocabulary. See ?RT.get_keywords for more information.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.87%. Comparing base (b89eb97) to head (fe6e81a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #205      +/-   ##
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+ Coverage   91.85%   91.87%   +0.02%     
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  Files          46       46              
  Lines        4372     4384      +12     
==========================================
+ Hits         4016     4028      +12     
  Misses        356      356              

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