Invalidate CommandEncoder on invalid commands

[sagudev]

Is your feature request related to a problem? Please describe.
Spec says that we should invalidate GPUCommandEncoder on invalid usage (see copybuffertobuffer for example). Currently error is just returned without invalidating command encoder.

Describe the solution you'd like
command_encoder_copy_buffer_to_buffer and others should also invalidate command encoder to match the spec.

Describe alternatives you've considered
Do nothing (this might be feature not a bug).

[cwfitzgerald]

We should ideally make this process automatic when an error is returned so this action isn't forgotton.