[#3688] Implement Objecttypes client

[Viicos]

Supersedes #3847

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (d3ce2c2) 96.34% compared to head (8c29618) 96.34%.

❗ Current head 8c29618 differs from pull request most recent head 2016f3c. Consider uploading reports for the commit 2016f3c to get more accurate results

Files	Patch %	Lines
...enforms/contrib/objects_api/clients/objecttypes.py	91.66%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3883      +/-   ##
==========================================
- Coverage   96.34%   96.34%   -0.01%     
==========================================
  Files         707      708       +1     
  Lines       22189    22213      +24     
  Branches     2547     2550       +3     
==========================================
+ Hits        21379    21401      +22     
  Misses        565      565              
- Partials      245      247       +2     

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