Feature/error interfaces

[johnabass]

Added an optional error interface that errors can implement to better categorize what they are. This will avoid having to know about a litany of concrete error types when trying to decide what action to take in the event of a security error.

[codecov]

Codecov Report

Attention: Patch coverage is 75.67568% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 32.74%. Comparing base (2ab6b16) to head (0c5b72b).
Report is 1 commits behind head on main.

Files	Patch %	Lines
basculehttp/error.go	0.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #245      +/-   ##
==========================================
+ Coverage   32.02%   32.74%   +0.71%     
==========================================
  Files          14       15       +1     
  Lines         434      452      +18     
==========================================
+ Hits          139      148       +9     
- Misses        295      304       +9     

Flag	Coverage Δ
unittests	32.74% <75.67%> (+0.71%)	⬆️

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