Multilingual Retrieval

[Impavidity]

• Add analyzer for different languages.
• Add documents and regression test for TREC2002 Arabic, CLEF2006 French, FIRE2012 English, Bengali and Hindi.

[codecov]

Codecov Report

Merging #901 into master will decrease coverage by 0.09%.
The diff coverage is 14.28%.

@@             Coverage Diff             @@
##             master     #901     +/-   ##
===========================================
- Coverage     35.83%   35.74%   -0.1%     
+ Complexity      463      462      -1     
===========================================
  Files           118      118             
  Lines          7104     7132     +28     
  Branches       1066     1078     +12     
===========================================
+ Hits           2546     2549      +3     
- Misses         4294     4310     +16     
- Partials        264      273      +9

Impacted Files	Coverage Δ	Complexity Δ
...main/java/io/anserini/search/SearchCollection.java	35.12% <0%> (-1.04%)	15 <0> (ø)
...c/main/java/io/anserini/search/SimpleSearcher.java	28.47% <0%> (-1.68%)	8 <0> (ø)
...c/main/java/io/anserini/index/IndexCollection.java	27.65% <33.33%> (+0.16%)	5 <0> (ø)	⬇️
...anserini/ltr/feature/base/PMIFeatureExtractor.java	84.61% <0%> (-1.93%)	12% <0%> (-1%)

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