Deprecate AbstractApi::post()

[Art4]

See #372

Requires #381

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.18%. Comparing base (3f6474f) to head (c516448).

Additional details and impacted files

@@             Coverage Diff              @@
##               v2.x     #383      +/-   ##
============================================
+ Coverage     97.71%   98.18%   +0.47%     
- Complexity      589      601      +12     
============================================
  Files            29       29              
  Lines          1707     1767      +60     
============================================
+ Hits           1668     1735      +67     
+ Misses           39       32       -7     

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[kbsali]

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