Adding support for generating data in JSON format.

[soumitra-st]

GenerateData command is an existing utility to generate random dataset based on a schema. This PR adds support for writing data in JSON format in addition to AVRO and CSV.

feature

[codecov-commenter]

Codecov Report

Merging #11778 (b1d6d2a) into master (24af80d) will decrease coverage by 0.03%.
Report is 1 commits behind head on master.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master   #11778      +/-   ##
============================================
- Coverage     14.45%   14.43%   -0.03%     
  Complexity      201      201              
============================================
  Files          2342     2342              
  Lines        125917   125931      +14     
  Branches      19370    19373       +3     
============================================
- Hits          18205    18175      -30     
- Misses       106170   106219      +49     
+ Partials       1542     1537       -5     

Flag	Coverage Δ
integration	<0.01% <0.00%> (ø)
integration1	<0.01% <0.00%> (ø)
integration2	0.00% <0.00%> (ø)
java-11	14.42% <0.00%> (-0.01%)	⬇️
java-17	14.40% <0.00%> (-0.04%)	⬇️
java-20	14.42% <0.00%> (+<0.01%)	⬆️
temurin	14.43% <0.00%> (-0.03%)	⬇️
unittests	14.42% <0.00%> (-0.03%)	⬇️
unittests2	14.42% <0.00%> (-0.03%)	⬇️

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Files	Coverage Δ
...ller/recommender/data/generator/DataGenerator.java	21.58% <0.00%> (-1.86%)	⬇️

... and 6 files with indirect coverage changes

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