Speed up getDirs
MERGE REQUEST
Overview
This MR adds workers to getDirs helper. getDirs is a recursive call so the number of workers is low and a note was added to the code.
Example for Visual Changes
Asciinema breaks when I try and record the print out from the entire skynet directory. But here is a recording from the recursive call of one of the sub-directories.
https://asciinema.org/a/MgYItyOi4ViXQrDWNo4avaJG2
Checklist
Review and complete the checklist to ensure that the MR is complete before assigned to an approver.
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All new methods or updated methods have clear docstrings 
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Testing added or updated for new methods 
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Any new packages are added to Makefile and .gitlab-ci.yml 
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API documentation updated for API updates 
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Module README.md updated for changes to workflow 
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Issue added to Sia-UI repo for new supporting features 
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Changelog File Created 
Issues Closed
Edited  by Matthew Sevey