implemented "with-timeout" plugin for testing the startup phase of lo…

[tclose]

…ng-running shell-command tasks

Types of changes

• New feature (non-breaking change which adds functionality)

Summary

This PR adds a new worker to be used solely for testing of interfaces (in particularly the auto-converted interfaces from nipype). Given it is to be used purely for test purposes, it isn't ideal to have to add it in globally into the WORKERS dict but there doesn't seem a way to "bring your own" worker. Perhaps this would be better

Checklist

• [ x ] I have added tests to cover my changes (if necessary)
• I have updated documentation (if necessary)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.36%. Comparing base (1720ba6) to head (4d59aca).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #732      +/-   ##
==========================================
+ Coverage   83.35%   83.36%   +0.01%     
==========================================
  Files          24       24              
  Lines        4949     4964      +15     
  Branches     1411     1411              
==========================================
+ Hits         4125     4138      +13     
- Misses        816      818       +2     
  Partials        8        8              

Flag	Coverage Δ
unittests	83.36% <100.00%> (+0.01%)	⬆️

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[tclose]

Closing in favour of BYO approach in #733