[Compound] Implement Snackbars based on designs (#1054)

* Make `InternalButton` internal instead of private so it can be customised.

Also, change the `ButtonColors.contentColor` for text buttons to `LocalContentColor.current` by default.

* Add temporary color for Snackbar action label

* Implement `Snackbar` component based on Compound

* Propagate changes to all other components

* Use right Preview annotation config

* Move `ButtonVisuals` to their own file

* Update screenshots

* Make previews internal

* Update screenshots

* Set a custom token for contentColor in AppBars

* Change 'Label' to 'Action' in the previews

* Add changelog

* Update screenshots

---------

Co-authored-by: ElementBot <benoitm+elementbot@element.io>

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