SCHEMA: Convert datatype lists to objects

[effigies]

This allows us to have an unambiguous name for each rule, such as schema.rules.datatypes.anat.nonparametric.

[tsalo]

I think the changes you need to make to make_entity_table and make_filename_template are pretty small. Both functions just loop through the list, so you just need loop through the dict instead.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.50%. Comparing base (acb2d92) to head (24c0aa4).

Additional details and impacted files

@@              Coverage Diff               @@
##           schema-sprint    #1074   +/-   ##
==============================================
  Coverage          71.50%   71.50%           
==============================================
  Files                  9        9           
  Lines                930      930           
==============================================
  Hits                 665      665           
  Misses               265      265           

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