[#3688] Add Objecttypes API endpoints

[Viicos]

Part of #3688

This is the one that was already reviewed and merged back in the original PR.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e56ce00) 96.34% compared to head (d7a2d80) 96.35%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3895   +/-   ##
=======================================
  Coverage   96.34%   96.35%           
=======================================
  Files         708      711    +3     
  Lines       22213    22250   +37     
  Branches     2550     2554    +4     
=======================================
+ Hits        21401    21438   +37     
  Misses        565      565           
  Partials      247      247           

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[vaszig]

I am a bit confused with this..What do you mean it's already reviewed and merged?

[Viicos]

It was a mess but this PR is the same as #3860, which was merged back into a closed PR (can be seen by looking at the target branch)