Add unit metadata to some scalar maps

[tsalo]

Relates to #229.

Changes proposed in this pull request

• Add Units field to sidecar files for DIPY DKI AD and DSIStudio AD scalar maps.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 13.61%. Comparing base (d0f82e0) to head (330b07d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #247   +/-   ##
=======================================
  Coverage   13.61%   13.61%           
=======================================
  Files          56       56           
  Lines        7508     7508           
  Branches     1017     1017           
=======================================
  Hits         1022     1022           
  Misses       6454     6454           
  Partials       32       32           

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