refactor(enhancement): streamline error function names and fields #1062

[jeevatkm]

The following method names are streamlined; next is documentation work:

Client.SetError 	-> Client.SetResultError
Request.SetError 	-> Request.SetResultError
Response.IsSuccess 	-> Response.IsStatusSuccess
Response.IsError 	-> Response.IsStatusFailure
Response.Err 		-> Response.CascadeError

close #1062

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.85%. Comparing base (f1c6d10) to head (bcae758).
⚠️ Report is 1 commits behind head on v3.

Additional details and impacted files

@@           Coverage Diff           @@
##               v3    #1097   +/-   ##
=======================================
  Coverage   99.85%   99.85%           
=======================================
  Files          18       18           
  Lines        3535     3535           
=======================================
  Hits         3530     3530           
  Misses          3        3           
  Partials        2        2           

Flag	Coverage Δ
unittests	99.85% <100.00%> (ø)

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