ENH: Add option to change data dtype

[mgxd]

Adds data_dtype option to DerivativesDataSink to allow coercing data into desired dtypes.

Inspired by nipreps/fmriprep#2001

[pull-assistant]

Best reviewed: commit by commit

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Optimal code review plan

     ENH: Add option to change data dtype

     Merge branch 'master' of github.com:nipreps/niworkflows into enh/deriv...

     ENH: set defaults for common suffixes

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[codecov]

Codecov Report

Merging #492 into master will increase coverage by 0.12%.
The diff coverage is 93.33%.

@@            Coverage Diff             @@
##           master     #492      +/-   ##
==========================================
+ Coverage   62.66%   62.78%   +0.12%     
==========================================
  Files          42       42              
  Lines        5046     5057      +11     
  Branches      732      732              
==========================================
+ Hits         3162     3175      +13     
+ Misses       1732     1728       -4     
- Partials      152      154       +2     

Flag	Coverage Δ
#documentation	33.88% <16.66%> (-0.01%)	⬇️
#masks	?
#reportlettests	100.00% <ø> (ø)
#travis	57.68% <93.33%> (+0.08%)	⬆️
#unittests	45.93% <93.33%> (+0.12%)	⬆️

Impacted Files	Coverage Δ
niworkflows/interfaces/bids.py	90.26% <93.33%> (-0.22%)	⬇️
niworkflows/interfaces/images.py	55.82% <0.00%> (+0.14%)	⬆️
niworkflows/viz/utils.py	80.06% <0.00%> (+0.24%)	⬆️
niworkflows/interfaces/mni.py	42.52% <0.00%> (+0.24%)	⬆️
niworkflows/utils/bids.py	77.17% <0.00%> (+0.82%)	⬆️

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