ENH: Add ConstrainedSphericalDeconvolution interface to replace EstimateFOD for MRtrix3's dwi2fod

[effigies]

Summary

This supersedes #3004 by creating the fixed interface as a new interface, avoiding the possibility of breaking existing workflows using msmt_csd. The new interface retains all of the capabilities of the original, so it isn't separating out msmt_csd and csd.

Fixes #2822.

Closes #3004.

@matteomancini WDYT?

List of changes proposed in this PR (pull-request)

Acknowledgment

• (Mandatory) I acknowledge that this contribution will be available under the Apache 2 license.

[codecov]

Codecov Report

Merging #3176 into master will decrease coverage by 2.34%.
The diff coverage is 59.89%.

@@            Coverage Diff             @@
##           master    #3176      +/-   ##
==========================================
- Coverage   67.22%   64.87%   -2.35%     
==========================================
  Files         343      299      -44     
  Lines       44823    39499    -5324     
  Branches     5609     5219     -390     
==========================================
- Hits        30131    25624    -4507     
+ Misses      13936    12826    -1110     
- Partials      756     1049     +293

Flag	Coverage Δ
#smoketests	?
#unittests	64.87% <59.89%> (+0.56%)	⬆️

Impacted Files	Coverage Δ
nipype/interfaces/afni/__init__.py	100% <ø> (ø)	⬆️
nipype/interfaces/ants/base.py	60% <ø> (-1.71%)	⬇️
nipype/interfaces/ants/__init__.py	100% <ø> (ø)	⬆️
nipype/interfaces/afni/model.py	86.93% <ø> (+4.97%)	⬆️
nipype/interfaces/base/core.py	83.85% <ø> (-3.14%)	⬇️
nipype/info.py	92.3% <ø> (+6.89%)	⬆️
nipype/interfaces/afni/preprocess.py	82.02% <ø> (ø)	⬆️
nipype/algorithms/modelgen.py	59.61% <ø> (-8.49%)	⬇️
nipype/interfaces/afni/svm.py	97.61% <ø> (-0.06%)	⬇️
nipype/interfaces/ants/segmentation.py	74.39% <ø> (-3.83%)	⬇️
... and 354 more

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