hwcontext_vulkan: add a new mechanism to expose used queue families

The issue with the old mechanism is that we had to introduce new
API each time we needed a new queue family, and all the queue families
were functionally fixed to a given purpose.

Nvidia's GPUs are able to handle video encoding and compute on the
same queue, which results in a speedup when pre-processing is required.

Also, this enables us to expose optical flow queues for frame interpolation.

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