Forms: add button color and typography global style controls

[simison]

Part of #41120

Needs more testing how these controls make sense and if they work well.

It should probably be split into two separate PRs for button colour and typography.

Proposed changes:

• Add typography support
• Add color.button support

Global styles editor

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[aaronrobertshaw]

Thanks for getting the ball rolling on this effort @simison 👍

It might be a touch early to review this one but I've taken it for a quick spin all the same.

While testing I noticed the following:

Text align support not working correctly in the editor

• Text alignments set in global styles don't work in the editor due to a wrapper around the label elements
• Alignments applied to the form block instance don't override those set in global styles when it comes to non-field blocks within the form e.g. Heading or Paragraph blocks

Limited typography supports

In Gutenberg, there is an ongoing effort to provide greater design tool consistency across blocks. This mostly centers around adopting all block supports for all blocks where it makes sense.

Given the desire to improve the form fields and adopt further block supports there, it might be a good idea to adopt all the other applicable typography supports here on the form block too e.g. font family, weight, style, text transform etc.

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I'm happy to help out here in any way I can. Let me know what might work for you.