Analyze all component `class` / `classes` handling

[techniq]

We need to analyze all components to see how they are handling class and classes, especially with a root component like <Field> (ex. DateField, SelectField, etc).

• [ ] Evaluate different approaches to setting class and classes
• [ ] Make sure the component classes can be set using:
  • class
  • classes
  • settings()
• [ ] Set .ComponentName class for top-level copmonents
• [ ] Make sure does not conflict with settings(), especially for root elements (should be able to set Field settings (classes/defaults) on *Field components
• [ ] ...