Add Mr.TyDi regressions for arabic

[lintool]

python src/main/python/run_regression.py --index --collection mrtydi-v1.1-ar

[codecov-commenter]

Codecov Report

Merging #1685 (b7b5a2f) into master (e33f1ff) will increase coverage by 0.08%.
The diff coverage is 74.54%.

@@             Coverage Diff              @@
##             master    #1685      +/-   ##
============================================
+ Coverage     57.23%   57.31%   +0.08%     
- Complexity     1029     1032       +3     
============================================
  Files           172      173       +1     
  Lines          9668     9721      +53     
  Branches       1336     1344       +8     
============================================
+ Hits           5533     5572      +39     
- Misses         3666     3675       +9     
- Partials        469      474       +5     

Impacted Files	Coverage Δ
.../java/io/anserini/collection/MrTyDiCollection.java	69.56% <69.56%> (ø)
src/main/java/io/anserini/eval/Qrels.java	100.00% <100.00%> (ø)
...c/main/java/io/anserini/index/IndexCollection.java	45.12% <100.00%> (+0.11%)	⬆️
...in/java/io/anserini/search/topicreader/Topics.java	100.00% <100.00%> (ø)

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