Nested Model Type object

[duckontheweb]

• Changes the model_type field to be an object containing the following fields:
  • learning_approach - Formerly the top-level algorithm_type field
  • prediction_type - Formerly the top-level model_type field
  • description - New field that allows publisher to use free text to describe the model type

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@batic @calebrob6

EDIT 2021-05-17: Top-level model-architecture field has been moved to model_type.architecture. Also added notes for required fields in model_type object.

[calebrob6]

Other than the model_architecture it looks good to me!