This change adds timeline semaphores to track submissions. The previous
implementation used a fence.
Timeline semaphores can be tracked in more detail as it is an counter.
For each submission the counter can be stored locally and when waiting
for completion the counter can be retrieved again and checked if is
known to be succeeded by a higher value.
The timeline semaphore is stored next to the queue and can also be used
to synchronize between multiple contexts.
Pull Request: https://projects.blender.org/blender/blender/pulls/115357
ec772ed2f1