Feature/allow source in validators

[johnabass]

A validation refactoring that allows much more flexible and simpler validation code.

[codecov]

Codecov Report

Attention: Patch coverage is 97.43590% with 3 lines in your changes missing coverage. Please review.

Project coverage is 67.32%. Comparing base (85e0935) to head (3336041).
Report is 27 commits behind head on main.

Files	Patch %	Lines
basculehttp/middleware.go	57.14%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #271       +/-   ##
===========================================
+ Coverage   32.74%   67.32%   +34.58%     
===========================================
  Files          15       14        -1     
  Lines         452      456        +4     
===========================================
+ Hits          148      307      +159     
+ Misses        304      141      -163     
- Partials        0        8        +8     

Flag	Coverage Δ
unittests	67.32% <97.43%> (+34.58%)	⬆️

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