Global Styles: Add support for google fonts in the site editor WIP

[jeyip]

Team Cylon is working on releasing Full Site Editing (currently found in the Gutenburg plugin) as an opt-in beta feature on WordPress.com. One of the features we plan to include is enabling the selection of Google fonts within the Global Styles settings found in the Site Editor, rather than only the default font choices. ( link )

Note that at the moment, you can only access Gutenberg’s Global Styles from the Site Editor, which only appears in wp-admin when using a block-based theme.

Fixes #

Changes proposed in this Pull Request:

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Testing instructions:

• Go to '..'

[matticbot]

Caution: This PR has changes that must be merged to WordPress.com
Hello jeyip! These changes need to be synced to WordPress.com - If you 're an a11n, please commandeer and confirm D65456-code works as expected before merging this PR. Once this PR is merged, please commit the changes to WP.com. Thank you!
This revision will be updated with each commit to this PR

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[jeherve]

Closing this in favor of #23045