issues/168: Add ReloadProtector middleware

[komuw]

What:

• Add a middleware that attempts to provides protection against a form re-submission when a user reloads/refreshes an already submitted web page/form.
  If such a situation is detected; this middleware will issue a http GET redirect to the same url.

Why:

• Fixes: protect against form re-submissions when page is refreshed #168

[codecov-commenter]

Codecov Report

Base: 71.34% // Head: 71.87% // Increases project coverage by +0.53% 🎉

Coverage data is based on head (27b4394) compared to base (91e474d).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #171      +/-   ##
==========================================
+ Coverage   71.34%   71.87%   +0.53%     
==========================================
  Files          30       31       +1     
  Lines        2066     2105      +39     
==========================================
+ Hits         1474     1513      +39     
  Misses        518      518              
  Partials       74       74              

Impacted Files	Coverage Δ
middleware/middleware.go	100.00% <100.00%> (ø)
middleware/reload_protect.go	100.00% <100.00%> (ø)

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