RF: Replace most of anat_ribbon_wf with a Python function

[effigies]

Got sidetracked and rewrote all of anat_ribbon_wf except the creating signed distance volumes in Python. Wrote unit and integration test to verify that we do get the same results before replacing.

[codecov]

Codecov Report

Patch coverage: 78.57% and project coverage change: -24.60% ⚠️

Comparison is base (244f1b2) 54.00% compared to head (fb05822) 29.41%.

Additional details and impacted files

@@             Coverage Diff             @@
##             next     #363       +/-   ##
===========================================
- Coverage   54.00%   29.41%   -24.60%     
===========================================
  Files          23       20        -3     
  Lines        1685     1676        -9     
  Branches      229      231        +2     
===========================================
- Hits          910      493      -417     
- Misses        719     1170      +451     
+ Partials       56       13       -43     

Flag	Coverage Δ
ds005	?
ds054	?
pytest	?

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Files Changed	Coverage Δ
smriprep/workflows/anatomical.py	12.12% <ø> (-32.96%)	⬇️
smriprep/workflows/surfaces.py	13.04% <33.33%> (+0.95%)	⬆️
smriprep/interfaces/surf.py	53.38% <84.00%> (+9.17%)	⬆️

... and 14 files with indirect coverage changes

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[effigies]

Noting here that the test passed with the old workflow.

[effigies]

@mgxd I would appreciate a review of this. The regression test that verifies consistent behavior is the main thing.

[mgxd]

dunno why cache failed, but this looks good to me