Support for custom setting of fontSize & padding on a button

[AlexChariyska]

Description

#20967 Adds a way to control the font size and padding of buttons block
Font size can be one of the defined values in the dropdown or a custom value
Padding is a custom value with shown visualizers when editing it.

How has this been tested?

Manually by adding the button block. Changes should be applied on the block and visualized when saving the post.

Screenshots

Settings Panel:

Custom padding and font-size on a button:


Example on a saved post preview:

Types of changes

New feature (non-breaking change which adds functionality)
Adds control for the button font-size & padding

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR.

[ramonjd]

I think the work on block supports has superseded this one.

The Button block supports padding as of #33859

See also #33447

[skorasaurus]

Thanks for your contributions; since published; padding and font size capabilities have been added to the button block; rendering this PR moot.