feat: refactor extract command with its tests

[shadinaif]

Refactor for more usability and readability. And to prepare tests to deal with options to be added to extract command in future pull-requests

• Get babel processing out of run method into a separate method named babel_extract
• Refactor TestExtract to avoid calling the mocked extract command unless it's needed. Doing that by creating a decorator named perform_extract

Change log?

None, just a code refactor

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[shadinaif]

This one is ready @OmarIthawi , @brian-smith-tcril

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.27% 🎉

Comparison is base (c3a9831) 99.47% compared to head (d7baf2c) 99.74%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #135      +/-   ##
==========================================
+ Coverage   99.47%   99.74%   +0.27%     
==========================================
  Files          10       10              
  Lines         381      399      +18     
  Branches       28       27       -1     
==========================================
+ Hits          379      398      +19     
+ Partials        2        1       -1     

Files Changed	Coverage Δ
tests/test_extract.py	100.00% <100.00%> (+2.00%)	⬆️

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[OmarIthawi]

Looks good to me. Thanks @shadinaif!!

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