feat(quartz): introduce new error variables

[reugn]

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 86.11111% with 5 lines in your changes missing coverage. Please review.

Project coverage is 95.01%. Comparing base (e4e93b2) to head (ac62bd0).

Files with missing lines	Patch %	Lines
quartz/queue.go	60.00%	2 Missing ⚠️
quartz/util.go	60.00%	2 Missing ⚠️
quartz/cron.go	91.66%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #139      +/-   ##
==========================================
+ Coverage   94.61%   95.01%   +0.39%     
==========================================
  Files          19       19              
  Lines         966      963       -3     
==========================================
+ Hits          914      915       +1     
+ Misses         34       31       -3     
+ Partials       18       17       -1     

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