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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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.