feat: implement -static-msg

[mattdowdell]

This adds support for enforcing log messages are static by requiring the use of string literals or constants.

Fixes #17.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (61cece7) 88.00% compared to head (4a41eaa) 88.67%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #18      +/-   ##
==========================================
+ Coverage   88.00%   88.67%   +0.67%     
==========================================
  Files           1        1              
  Lines         200      212      +12     
==========================================
+ Hits          176      188      +12     
  Misses         19       19              
  Partials        5        5              

Files	Coverage Δ
sloglint.go	88.67% <100.00%> (+0.67%)	⬆️

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[tmzane]

@mattdowdell Thank you!

[mattdowdell]

@tmzane What's the process for gettng the new options added here and in previous PRs available in golangci-lint? I'm happy to drive that forward, but any pointers you can provide would be appreciated.

[tmzane]

@mattdowdell the previous options should be available as soon as #4166 is merged and the next release of golangci-lint is published. Speaking about -static-msg, I just pushed v0.3.0 that includes it, should appear as a separate PR by dependabot. You could also use sloglint standalone until the new features are available in golangci-lint 😉