fix: use errors.As to get StatusError, enabling wrapping

[danielgtaylor]

This updates the code to allow wrapping of the HTTP status errors, which can be useful to provide additional context for logging among other things. Adds a couple of tests to ensure it works as expected.

Fixes #380.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.51%. Comparing base (864ecb4) to head (1971cc6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #381   +/-   ##
=======================================
  Coverage   92.51%   92.51%           
=======================================
  Files          20       20           
  Lines        3513     3514    +1     
=======================================
+ Hits         3250     3251    +1     
  Misses        224      224           
  Partials       39       39           

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