Implement Floating Button Page component

[J-Son89]

In a lot of the screens in the redesign there is the following structure.

A vertical screen with a header and content that scrolls with a call to action at the bottom of the page ->
This can be seen on the login page, create password page and many pages in the wallet designs.

This component has some further features.The button should sit at the bottom of the page, when the keybaord is showing this button should raise and sit on top of the keyboard. if the button is then covering the content of the scroll view it should have a blurred background.

Acceptance Criteria:
Implement this component as a standalone component with it's own preview screen.
handle for android and ios
component spec