ENH: Add command line options to restructure outputs

[mgxd]

Adds logic to restructure workflow output to be more easily consumed by the HBCD data management system.

This new command line option, nibabies-hbcd, restructure FreeSurfer and mcribs output directories to follow the BIDS hierarchy (from sub-X_ses-Y to sub-X/ses-Y) and removes any symlinks.

[codecov]

Codecov Report

Attention: Patch coverage is 75.84270% with 43 lines in your changes missing coverage. Please review.

Project coverage is 56.90%. Comparing base (aaa532c) to head (739f460).

Files with missing lines	Patch %	Lines
nibabies/cli/parser.py	61.00%	34 Missing and 5 partials ⚠️
nibabies/cli/hbcd.py	91.66%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #454      +/-   ##
==========================================
+ Coverage   56.46%   56.90%   +0.44%     
==========================================
  Files          70       72       +2     
  Lines        6723     6801      +78     
  Branches      828      837       +9     
==========================================
+ Hits         3796     3870      +74     
- Misses       2718     2720       +2     
- Partials      209      211       +2     

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