Removing OkHttp3 dependencies

[artur-ciocanu]

Description

The purpose of this PR is to get rid of OkHttp3 so we could simplify dependencies management and ensure that we use as much as we can OOTB functionality from JDK without depending on external libraries.

Issue reference

We strive to have all PR being opened based on an issue, where the problem or feature have been discussed prior to implementation.

Please reference the issue this PR will close: #1312

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests
• Extended the documentation

[artur-ciocanu]

@salaboy @mcruzdev and @cicoyle could you please take a look and let me know if we can merge it. Thank you.

[artur-ciocanu]

@cicoyle the build is green, except coverage task, could you please review and approve. Thank you!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.42%. Comparing base (d759c53) to head (147af2e).
Report is 127 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1313      +/-   ##
============================================
- Coverage     76.91%   75.42%   -1.50%     
- Complexity     1592     1606      +14     
============================================
  Files           145      194      +49     
  Lines          4843     5090     +247     
  Branches        562      559       -3     
============================================
+ Hits           3725     3839     +114     
- Misses          821      932     +111     
- Partials        297      319      +22     

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