Custom non-animating widget of Showcase.withWidget

[MichaelCadavillo]

Is your feature request related to a problem? Please describe.
I want to provide an option to my users an easily accessible button to skip the showcase immediately, instead of going through each one by one.

Describe the solution you'd like
Add a custom static version of the 'Showcase.withWidget's container property which can be placed anywhere on the screen and is not affected by the animation applied to container.

Describe alternatives you've considered

• Tried including it inside the container property however, I don't want the button to move along with the animation. Also wanted to at least get the remaining space on the screen that I can use (to persist on the bottom of the showcase).
• Tried wrapping the root widget (Outside of ShowCaseWidget), I was able to see the button however I want it to be on the foreground as well and not be greyed out in the background.

Additional context

As you can see from the GIF above, the "Your sender's profile" widget is still animating whilst the "Skip showcase" button down below is static and is accessible at any given time.