Draft: vulkan: Avoid blocking waits on the gpu on blit
This allows the blit-filter to run in synchronous or asynchronous mode. In asynchronous mode the blocking wait on the gpu is replaced by registering a fd from vulkan with the event loop.
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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
This allows the blit-filter to run in synchronous or asynchronous mode. In asynchronous mode the blocking wait on the gpu is replaced by registering a fd from vulkan with the event loop.