SCHEMA: Add .dtseries.nii extension for resampled functional time series

[rwblair]

These show up in examples on the site, though they aren't listed in a template.

[tsalo]

What about throwing in other CIFTI extensions? dscalar, ptseries, pconn, etc.

[rwblair]

@tsalo There isn't a comprehensive list in the specification. I just added the one I saw in examples.

Where should a template for these live? (what all extensions/modalities/etc should be included?)

Dtseries reference is just before the mask header here: https://bids-specification.readthedocs.io/en/stable/05-derivatives/03-imaging.html

[rwblair]

List of all extensions: https://www.nitrc.org/forum/attachment.php?attachid=342&group_id=454&forum_id=1955

[codecov[bot]]

Codecov Report

Base: 88.39% // Head: 88.50% // Increases project coverage by +0.10% :tada:

Coverage data is based on head (efe4d8c) compared to base (acd7fe4). Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1331      +/-   ##
==========================================
+ Coverage   88.39%   88.50%   +0.10%     
==========================================
  Files          11       11              
  Lines        1086     1087       +1     
==========================================
+ Hits          960      962       +2     
+ Misses        126      125       -1     

Impacted Files	Coverage Δ
tools/schemacode/bidsschematools/validator.py	96.24% <0.00%> (+0.35%)	:arrow_up:

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