hellofromTonya 053b9bbd71 Themes: Add internal-only theme.json's webfonts handler (stopgap). ...

Adds `_wp_theme_json_webfonts_handler()` for handling `fontFace` declarations in a theme's `theme.json` file to generate the `@font-face` styles for both the editor and front-end.

Design notes:
* It is not a public API, but rather an internal, Core-only handler.
* It is a stopgap implementation that will be replaced when the public Webfonts API is introduced in Core.
* The code design is intentional, albeit funky, with the purpose of avoiding backwards-compatibility issues when the public Webfonts API is introduced in Core.
   * It hides the inter-workings.
   * Does not exposing API ins and outs for external consumption.
   * Only works for `theme.json`.
   * Does not provide registration or enqueuing access for plugins.

For more context on the decision to include this stopgap and the Webfonts API, see:
* Core's PR 40493 https://github.com/WordPress/gutenberg/pull/40493
* Gutenberg's tracking issue 40472 https://github.com/WordPress/gutenberg/issues/40472

Props aristath, hellofromTonya, peterwilsoncc, costdev, jffng, zieladam, gziolo, bph, jonoaldersonwp, desrosj.

See #55567, #46370.
Built from https://develop.svn.wordpress.org/trunk@53282


git-svn-id: http://core.svn.wordpress.org/trunk@52871 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2022-04-26 14:48:09 +00:00

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