Fixes for issue UnimplementedInterfaceMethod: Method getsupportedtypes is not defined

[kedarkhaire]

Fixes #384

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 8 lines in your changes missing coverage. Please review.

Project coverage is 86.68%. Comparing base (f43f83e) to head (843da2d).

Files with missing lines	Patch %	Lines
src/Api/Management/Query/StatsQueryNormalizer.php	0.00%	4 Missing ⚠️
src/Serializer/EntitySerializer.php	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                4.x     #385      +/-   ##
============================================
- Coverage     86.81%   86.68%   -0.14%     
- Complexity     1768     1771       +3     
============================================
  Files           349      349              
  Lines          4643     4655      +12     
============================================
+ Hits           4031     4035       +4     
- Misses          612      620       +8     

Flag	Coverage Δ
unittests	86.68% <33.33%> (-0.14%)	⬇️

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Files with missing lines	Coverage Δ
...eX/Denormalizer/AppGroupMembershipDenormalizer.php	94.73% <100.00%> (+1.40%)	⬆️
src/Api/Management/Query/StatsQueryNormalizer.php	80.00% <0.00%> (-12.31%)	⬇️
src/Serializer/EntitySerializer.php	80.30% <0.00%> (-5.19%)	⬇️