moved psutil from test dep to core dep

[tclose]

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Summary

Adds psutil as core dependency instead of just test. When resources are audited it imports the pydra.utils.profiler module, which has psutil as a dep.

Fixes #760

Checklist

• 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 87.88%. Comparing base (47c3958) to head (5ce4d1b).
⚠️ Report is 109 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #817      +/-   ##
==========================================
- Coverage   87.89%   87.88%   -0.02%     
==========================================
  Files          84       84              
  Lines       17890    17897       +7     
  Branches     3483     3484       +1     
==========================================
+ Hits        15725    15729       +4     
- Misses       1809     1814       +5     
+ Partials      356      354       -2     

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[effigies]

I think we should endeavor to keep dependencies light, and core dependencies should be those necessary to access core functionality.

If audits are core functionality, then fine, but otherwise we could create an audit extra and documentation that indicates that users wishing to use that functionality should install that extra.

[tclose]

I'm easy either way. An 'audit' extra sounds like a reasonable idea, we just need to make sure that audit isn't imported unless it is used