Add command SetVisibilityTimeout

[dbenders]

No description provided.

[craigpastro]

Hey @dbenders! This PR LGTM! I just pushed a fix for the TestQueue error. If you rebase then we can merge this. Thanks for your contribution!

Edit: I'll rebase.
Edit2: One small comment.

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 89.61%. Comparing base (0bbf6f7) to head (7fbcde3).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pgmq.go	59.09%	6 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #73      +/-   ##
==========================================
- Coverage   90.43%   89.61%   -0.83%     
==========================================
  Files           2        2              
  Lines         523      568      +45     
==========================================
+ Hits          473      509      +36     
- Misses         33       39       +6     
- Partials       17       20       +3     

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[craigpastro]

Thanks for your contribution ❤️