[wip] Add spotbugs plugin.

[anurag-paliwal]

Summary (Short summary of what is being done) :

Description (Describe in detail the fix made) :

Bug ID (if any) :

Public Documentation (if any) :

TESTED (Test Cases with scenario and description - must have 1 positive and 1 negative scenario) :

[codecov[bot]]

Codecov Report

Merging #174 (b292c15) into master (deb71bd) will decrease coverage by 0.09%. Report is 3 commits behind head on master. The diff coverage is 10.09%.

@@             Coverage Diff              @@
##             master     #174      +/-   ##
============================================
- Coverage     12.45%   12.37%   -0.09%     
  Complexity       63       63              
============================================
  Files            53       53              
  Lines          2480     2521      +41     
  Branches        207      209       +2     
============================================
+ Hits            309      312       +3     
- Misses         2152     2190      +38     
  Partials         19       19              

Files	Coverage Δ
...swarm/tokenization/DLPTextToBigQueryStreaming.java	0.00% <ø> (ø)
...m/google/swarm/tokenization/common/FileReader.java	0.00% <ø> (ø)
...ava/com/google/swarm/tokenization/common/Util.java	30.82% <100.00%> (+0.24%)	:arrow_up:
...ogle/swarm/tokenization/orc/ORCColumnNameDoFn.java	100.00% <100.00%> (ø)
...m/google/swarm/tokenization/orc/ORCFileReader.java	100.00% <100.00%> (ø)
...gle/swarm/tokenization/beam/DLPReidentifyText.java	0.00% <0.00%> (ø)
...warm/tokenization/common/SanitizeFileNameDoFn.java	45.45% <0.00%> (ø)
...le/swarm/tokenization/parquet/RecordFlattener.java	0.00% <0.00%> (ø)
...nization/common/BigQueryDynamicWriteTransform.java	0.00% <0.00%> (ø)
...kenization/common/ExtractColumnNamesTransform.java	0.00% <0.00%> (ø)
... and 17 more

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