ENH: Add Resolution field to metadata if data has res entity

[mgxd]

Closes #752

[codecov-commenter]

Codecov Report

Base: 62.22% // Head: 62.35% // Increases project coverage by +0.13% 🎉

Coverage data is based on head (801e2c7) compared to base (5b898c4).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #754      +/-   ##
==========================================
+ Coverage   62.22%   62.35%   +0.13%     
==========================================
  Files          49       49              
  Lines        5935     5956      +21     
  Branches     1167     1173       +6     
==========================================
+ Hits         3693     3714      +21     
  Misses       2060     2060              
  Partials      182      182              

Flag	Coverage Δ
reportlettests	∅ <ø> (∅)
unittests	49.40% <100.00%> (+0.18%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
niworkflows/interfaces/bids.py	96.39% <100.00%> (+0.24%)	⬆️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.

[effigies]

We should do the same with den, which CIFTI and GIFTI files may have.

[mgxd]

@effigies Do you have any suggestions on how to grab that information? Load up the gii/dtseries.nii and sum the vertices / grayordinates?

[effigies]

I assumed there was metadata, as with res.

[mgxd]

Nope, opened templateflow/templateflow#145 though