Interactivity API: Integrate Server Directive Processing
The Interactivity API enables WordPress developers to create dynamic and interactive web experiences with ease using a set of special HTML attributes called directives. Please refer to the [Interactivity API proposal](https://make.wordpress.org/core/2023/03/30/proposal-the-interactivity-api-a-better-developer-experience-in-building-interactive-blocks/) for further details.
It syncs the changes from the Gutenberg plugin: https://github.com/WordPress/gutenberg/pull/58066.
Fixes #60356.
Props luisherranz, jonsurrell, swissspidy, westonruter, gziolo.
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