feat!: enhance and add feature into digest auth flow #914

[jeevatkm]

• redesign the digest auth internals, cleanup, and improvements
• add 'auth-int' QOP support
• add and update digest hash functions
• remove the 'Request.SetDigestAuth' method, keep the option only at the client level

closes #914

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.55%. Comparing base (f18ee43) to head (cda801e).
Report is 15 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #921      +/-   ##
==========================================
+ Coverage   98.79%   99.55%   +0.75%     
==========================================
  Files          15       15              
  Lines        3230     3345     +115     
==========================================
+ Hits         3191     3330     +139     
+ Misses         28       10      -18     
+ Partials       11        5       -6     

Flag	Coverage Δ
unittests	99.55% <100.00%> (+0.75%)	⬆️

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