Implement a middleware message

[peterfox]

Changes In Code

Adds the ability to provide a string or translatable key to use with the middleware as a message for the response.

Issue ticket number / Business Case

It allows for more flexibility with the middleware to explain why a feature is not accessible.

Checklist before requesting a review

• I have written PHP tests.
• I have updated the documentation in the readme where needed.
• I have checked code styles, PHPStan etc. pass.
• I have provided an issue/business case.

[codecov-commenter]

Codecov Report

Merging #49 (c2a8044) into main (08a47dd) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##               main      #49   +/-   ##
=========================================
  Coverage     80.08%   80.08%           
  Complexity      170      170           
=========================================
  Files            27       27           
  Lines           462      462           
=========================================
  Hits            370      370           
  Misses           92       92           

Impacted Files	Coverage Δ
src/Middlewares/GuardFeature.php	100.00% <100.00%> (ø)

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