Build: Enable React Fast Refresh for block development
Brings the same functionality introduced in the Gutenberg plugin with https://github.com/WordPress/gutenberg/pull/28273. In effect, it brings React Fast Refresh support to WordPress core for block development with `@wordpress/scripts`.
Props walbo, antonvlasenko.
See #51750, #55505.
Follow-up [53135].
Built from https://develop.svn.wordpress.org/trunk@53140
git-svn-id: http://core.svn.wordpress.org/trunk@52729 1a063a9b-81f0-0310-95a4-ce76da25c4cd