Added batch equivalent of computeQueryDocumentScore

[HAKSOAT]

Addresses #1484

[codecov-commenter]

Codecov Report

Merging #1882 (3e06d73) into master (4430ac4) will increase coverage by 0.06%. The diff coverage is 77.77%.

@@             Coverage Diff              @@
##             master    #1882      +/-   ##
============================================
+ Coverage     57.74%   57.80%   +0.06%     
- Complexity     1058     1065       +7     
============================================
  Files           179      179              
  Lines         10301    10328      +27     
  Branches       1417     1419       +2     
============================================
+ Hits           5948     5970      +22     
- Misses         3852     3857       +5     
  Partials        501      501              

Impacted Files	Coverage Δ
.../main/java/io/anserini/index/IndexReaderUtils.java	76.89% <77.77%> (+0.10%)	:arrow_up:
...a/io/anserini/analysis/DefaultEnglishAnalyzer.java	78.04% <0.00%> (+2.43%)	:arrow_up:

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[HAKSOAT]

Hi @lintool I'd appreciate a review here when chanced.