Remove unneeded params from HyperTransformer

[npatki]

Problem Description

With the new changes to HyperTransformer, the user won't need to params when instantiating a HyperTransformer.

Expected behavior

Remove all params:

• field_transformers -- Users can set via a method (see Update transformers by column name in HyperTransformer #402)
• field_data_types -- Users can set via a method (see Improve updating field_data_types in HyperTransformer #400)
• default_data_type_transformers -- Users can set via a method (see Update transformers by data type (in HyperTransformer) #403)
• copy -- We should always copy the data
• transform_output_types -- Turned into a property (see Rename property: _valid_output_sdtypes #406)

As a result, the constructor for HyperTransformer should be empty

>>> ht = HyperTransformer()