chore!: Styled Components (#52)

* Add Box component

* Add baseClassName to Box

* Refactor Icon to use Box

* Add Text component

* Add withProps helper

* Refactor Button

* Fix displayName on Icon and Button

* Refactor ButtonGroup

* Rollback the Box component

* Refactor CheckBox, RadioButton, and ToggleSwitch

* Refactor Input; remove InputGroup; add Field and FieldGroup