ENH: Add separate workflow to run with a single anatomical

[mgxd]

The PR allows processing of data with only a single modality (T1 or T2) anatomical acquisition.

For best results, nibabies still recommends using both modalities in harmony.

[pep8speaks]

Hello @mgxd! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file nibabies/workflows/anatomical/base.py:

Line 755:101: E501 line too long (103 > 100 characters)

Comment last updated at 2023-10-05 15:16:34 UTC

[codecov]

Codecov Report

Attention: 163 lines in your changes are missing coverage. Please review.

Comparison is base (edcbd2b) 33.28% compared to head (bc7ee38) 32.81%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #316      +/-   ##
==========================================
- Coverage   33.28%   32.81%   -0.47%     
==========================================
  Files          55       55              
  Lines        5195     5315     +120     
==========================================
+ Hits         1729     1744      +15     
- Misses       3466     3571     +105     

Files	Coverage Δ
nibabies/utils/bids.py	42.85% <ø> (ø)
nibabies/workflows/anatomical/__init__.py	100.00% <100.00%> (ø)
nibabies/workflows/anatomical/segmentation.py	19.73% <ø> (+0.50%)	⬆️
nibabies/workflows/base.py	25.90% <0.00%> (-0.32%)	⬇️
nibabies/workflows/anatomical/outputs.py	9.93% <9.09%> (+1.27%)	⬆️
nibabies/workflows/anatomical/base.py	10.59% <11.47%> (+2.33%)	⬆️

... and 1 file with indirect coverage changes

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