Add a factory method for setting public messages

[knpwrs]

I missed this function in #22

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 77.55%. Comparing base (7408667) to head (eb3b724).

Files	Patch %	Lines
oops.go	0.00%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #23      +/-   ##
==========================================
- Coverage   77.71%   77.55%   -0.17%     
==========================================
  Files          10       10              
  Lines         929      931       +2     
==========================================
  Hits          722      722              
- Misses        175      177       +2     
  Partials       32       32              

Flag	Coverage Δ
unittests	77.55% <0.00%> (-0.17%)	⬇️

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[samber]

v1.13.1