Associate command encoding with a queue#1278

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kvark wants to merge 3 commits intogpuweb:mainfrom

kvark:queue-encoding

Commits on Dec 7, 2020

Move command encoding to a queue
kvark
committed

Commits on Dec 8, 2020

Move command encoder creation back to GPUDevice
kvark
committed

Commits on Dec 9, 2020

Apply Kai's suggestions
kvark
committed