RFC: anv: Implement VK_EXT_queue_family_foreign
By itself, this extension does nothing. It's only useful in its interaction with other external memory extensions. In the short term, at least, anvil will do nothing on transitions to/from the foreign queue. There does exist, though, some possibility to eventually distinguish between transitions on VK_QUEUE_FAMILY_EXTERNAL_KHR and VK_QUEUE_FAMILY_FOREIGN_EXT for ccs_e images.
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