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

Before

After

Block editor

Before

After

Other information:

• Have you written new tests for your changes, if applicable?
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Jetpack product discussion

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Testing instructions:

• Go to '..'

[github-actions]

Are you an Automattician? Please test your changes on all WordPress.com environments to help mitigate accidental explosions.

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[github-actions]

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