Add support for OAR Scheduler

[ychiat35]

Types of changes

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

Summary

The Oar scheduler is widely used in France, including mesocentre supercomputers (e.g., GRICAD), INRIA supercomputers, Grid5000 testbed and other platforms.

This PR adds support for the OAR Scheduler, following the implementation made for Slurm.

Checklist

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

[codecov]

Codecov Report

Attention: 103 lines in your changes are missing coverage. Please review.

Comparison is base (0e3d33c) 83.52% compared to head (e54491c) 81.86%.

❗ Current head e54491c differs from pull request most recent head 3cadef2. Consider uploading reports for the commit 3cadef2 to get more accurate results

Files	Patch %	Lines
pydra/engine/workers.py	7.20%	103 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #713      +/-   ##
==========================================
- Coverage   83.52%   81.86%   -1.67%     
==========================================
  Files          23       23              
  Lines        4990     5101     +111     
  Branches     1429     1453      +24     
==========================================
+ Hits         4168     4176       +8     
- Misses        814      917     +103     
  Partials        8        8              

Flag	Coverage Δ
unittests	81.86% <7.20%> (-1.67%)	⬇️

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[djarecka]

@ychiat35 - thank you for adding this worker. Would it be possible to test it within a container?

[ychiat35]

@ychiat35 - thank you for adding this worker. Would it be possible to test it within a container?

Hi, I'm trying to use oar-docker to do that. It is still WIP (I have to find more time doing that) but I noticed that the oar-docker solution requires cgroup v1, so I have to run on ubuntu-20.04 but not ubuntu-latest. Is this a problem for you?