ENH: Add CiftiCreateDenseTimeseries

[effigies]

Here's another one.

xref #49

[codecov-commenter]

Codecov Report

Merging #53 (f933315) into master (ee30106) will increase coverage by 0.44%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #53      +/-   ##
==========================================
+ Coverage   27.99%   28.44%   +0.44%     
==========================================
  Files          42       42              
  Lines        3068     3087      +19     
==========================================
+ Hits          859      878      +19     
  Misses       2209     2209              

Impacted Files	Coverage Δ
nibabies/interfaces/conftest.py	100.00% <ø> (ø)
nibabies/interfaces/workbench.py	100.00% <100.00%> (ø)

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