[BigQueryWorkloadTester] Adding classes that will take the workload results and convert them into json files for output

[ldanielmadariaga]

[BigQueryWorkloadTester] Adding classes that will take the workload results and convert them into json files for output

[codecov[bot]]

Codecov Report

Merging #198 into dev will decrease coverage by 1.41%. The diff coverage is 57.69%.

@@             Coverage Diff              @@
##                dev     #198      +/-   ##
============================================
- Coverage     87.93%   86.51%   -1.42%     
- Complexity      183      197      +14     
============================================
  Files            30       34       +4     
  Lines           986     1038      +52     
  Branches         61       61              
============================================
+ Hits            867      898      +31     
- Misses          111      131      +20     
- Partials          8        9       +1

Impacted Files	Coverage Δ	Complexity Δ
...loud/pontem/result/JsonResultProcessorFactory.java	0% <0%> (ø)	0 <0> (?)
...e/cloud/pontem/result/JsonResultProcessorTest.java	100% <100%> (ø)	8 <8> (?)
...m/google/cloud/pontem/result/ResultFileWriter.java	5.88% <5.88%> (ø)	1 <1> (?)
...oogle/cloud/pontem/result/JsonResultProcessor.java	90.9% <90.9%> (ø)	4 <4> (?)
...gle/cloud/pontem/testing/WorkloadResultHelper.java	98.33% <0%> (+1.66%)	14% <0%> (+1%)	:arrow_up: