[wp-trac] [WordPress Trac] #59003: Add `wp_get_theme_data_template_parts` function

[WordPress Trac]

#59003: Add `wp_get_theme_data_template_parts` function
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 Reporter:  oandregal    |      Owner:  oandregal
     Type:  enhancement  |     Status:  assigned
 Priority:  normal       |  Milestone:  6.4
Component:  General      |    Version:  trunk
 Severity:  normal       |   Keywords:
  Focuses:               |
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 Part of https://github.com/WordPress/gutenberg/issues/45171

 **What**

 Add a new public function, `wp_get_theme_data_template_parts` to query the
 template parts metadata defined by the theme via `theme.json`. It also
 substitutes current usage of private APIs.

 **Why?**

 We need to offer public APIs for consumers to retrieve the data they need,
 so they don't resort to using private APIs.

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Ticket URL: <https://core.trac.wordpress.org/ticket/59003>
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