FIX: Use nitransforms for most xfm handling

[mgxd]

Closes #420

[codecov]

Codecov Report

Attention: Patch coverage is 13.79310% with 25 lines in your changes missing coverage. Please review.

Project coverage is 56.17%. Comparing base (b7e3fcc) to head (d338dd0).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
nibabies/utils/transforms.py	14.28%	18 Missing ⚠️
nibabies/workflows/bold/registration.py	0.00%	6 Missing ⚠️
nibabies/interfaces/resampling.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #421      +/-   ##
==========================================
+ Coverage   56.01%   56.17%   +0.15%     
==========================================
  Files          69       70       +1     
  Lines        6675     6653      -22     
  Branches      830      827       -3     
==========================================
- Hits         3739     3737       -2     
+ Misses       2732     2712      -20     
  Partials      204      204              

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