refactor!: module package structure

[reugn]

• Extract the internal and logger packages.
• Create a job package containing implementations of the quartz.Job interface.

[codecov-commenter]

Codecov Report

Attention: 14 lines in your changes are missing coverage. Please review.

Comparison is base (49ce1d9) 85.64% compared to head (4c271ff) 83.80%.

Files	Patch %	Lines
job/shell_job.go	84.61%	7 Missing and 1 partial ⚠️
job/curl_job.go	86.36%	6 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #87      +/-   ##
==========================================
- Coverage   85.64%   83.80%   -1.85%     
==========================================
  Files          12       14       +2     
  Lines         815      815              
==========================================
- Hits          698      683      -15     
- Misses         82       97      +15     
  Partials       35       35              

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