Natml

+ Remove prediction session logging.

+ Update `api.EndpointAcceleration` enumeration with current acceleration options provided by NatML CloudKit.

+ Added support for returning `ndarray` instances in `PredictionSession.create` method.
+ Added `api.Storage` class for managing uploads and downloads with NatML.
+ Added `api.Dtype.list` data type for handling JSON object lists.
+ Added `api.Dtype.dict` data type for handling JSON objects.
+ Added `--learn` CLI options for learning more about core NatML resources.
+ Added support for showing returned images when making predictions with the CLI.

+ Completed CLI.

+ Removed template generation from CLI.

+ Removed `features` and `types` subpackages.