Form component: Add support for redirect_to in the controller.

[fiedl]

Changes

• When a transition follows the server response,

  class MyPage
    def form_config
      {
        # ...
        success: {
          transition: {
            follow_response: true
          }
        }
      }
    end
  end

  the controller can set the destination via redirect_to:

  class MyController
    def update
      my_model.update model_params
      redirect_to root_path
    end
  end

Notes

• This is analogue to the action component: Implementing follow_response for action component #317.
• This supports multiple redirects in the controller layer.

[jonasjabari]

cool!