Added unit test to compile add generated class.

[li-ukumar]

What

Unit test to find all generated files in avro-builder-> tests and compile assert compile

Why

Explicit compilation test was missing on all classes generated by Codegen.

Test

NA

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +0.01% :tada:

Comparison is base (4640b55) 45.80% compared to head (f6843e5) 45.82%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #513      +/-   ##
============================================
+ Coverage     45.80%   45.82%   +0.01%     
- Complexity     4433     4439       +6     
============================================
  Files           398      398              
  Lines         28040    28040              
  Branches       4622     4622              
============================================
+ Hits          12845    12850       +5     
  Misses        13635    13635              
+ Partials       1560     1555       -5     

see 5 files with indirect coverage changes

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