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When registering blocks on the server using `register_block_type()` or similar functions, a set of block type variations can also be registered. However, in some cases building this variation data during block registration can be an expensive process, which is not needed in most contexts. To address this problem, this adds support to the `WP_Block_Type` object for a new property, `variation_callback`, which can be used to register a callback for building variation data only when the block variations data is needed. The `WP_Block_Type::variations` property has been changed to a private property that is now accessed through the magic `__get()` method. The magic getter makes use of a new public method, `WP_Block_Type::get_variations` which will build variations from a registered callback if variations have not already been built. Props spacedmonkey, thekt12, Mamaduka, gaambo, gziolo, mukesh27, joemcgill. Fixes #59969. git-svn-id: https://develop.svn.wordpress.org/trunk@57315 602fd350-edb4-49c9-b593-d223f7449a82