AvroCodecUtil#serializeJson() - add method with bool oneline option

[dg-builder]

What

Adding a method to get one-line serialized schemas.

Why

Users want to get one-line serialized schemas

Test

[codecov-commenter]

Codecov Report

Patch coverage: 50.00% and project coverage change: -0.01% ⚠️

Comparison is base (60fa32a) 45.83% compared to head (ee85ff7) 45.83%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #510      +/-   ##
============================================
- Coverage     45.83%   45.83%   -0.01%     
- Complexity     4439     4440       +1     
============================================
  Files           398      398              
  Lines         28041    28042       +1     
  Branches       4621     4622       +1     
============================================
  Hits          12853    12853              
  Misses        13634    13634              
- Partials       1554     1555       +1     

Files Changed	Coverage Δ
...inkedin/avroutil1/compatibility/AvroCodecUtil.java	75.94% <50.00%> (-0.98%)	⬇️

... and 5 files with indirect coverage changes

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