Improvements for EVP_PKEY support

[andrey-kashcheev]

Improved documentation and error handling

Relates-To: HERESUP-72189

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.29%. Comparing base (4caac60) to head (033142f).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1700      +/-   ##
==========================================
- Coverage   80.31%   80.29%   -0.02%     
==========================================
  Files         356      356              
  Lines       14279    14279              
  Branches     1563     1562       -1     
==========================================
- Hits        11468    11465       -3     
- Misses       2183     2184       +1     
- Partials      628      630       +2     

see 4 files with indirect coverage changes

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