Add jobs.Runner

[markuswustenberg]

This adds a new package jobs which provides an abstraction to run background jobs, backed by the queue.

[codecov]

Codecov Report

Attention: Patch coverage is 83.07692% with 22 lines in your changes are missing coverage. Please review.

Project coverage is 90.17%. Comparing base (9abc8f8) to head (b907807).

Files	Patch %	Lines
jobs/runner.go	82.53%	17 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #38      +/-   ##
==========================================
+ Coverage   89.83%   90.17%   +0.34%     
==========================================
  Files           2        3       +1     
  Lines         236      336     +100     
==========================================
+ Hits          212      303      +91     
- Misses         17       25       +8     
- Partials        7        8       +1     

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