fix: add data binding model imports

[dpilch]

The model imports for data bindings are missing.

Example import:

import { User } from '../models';

• add model imports when needed with data bindings.
• set correct data type for props on data bindings.
  • previously the type was set to Data rather than the correct model.

Old:

export type CustomButtonProps = { buttonUser?: Data }

New:

export type CustomButtonProps = { buttonUser?: User }

Testing:
Add new unit test based on golden file for component with data binding.