Right now we encode copy commands as soon as they are called and render/compute pass commands on pass.end(). We should move the encoding to CommandEncoder.finish() so that we have more information available to generate better barriers and (on d3d12) to manage descriptor heaps.

Related:

• [Metal] Render/Compute pass forces command buffer finish at the end #5738
• Command encoding validation should not emit errors before CommandEncoder::finish #7391
• Tracking Issue and Proposal for the Next Step of wgpu Automatic Synchronization Generation #1260
• https://bugzilla.mozilla.org/show_bug.cgi?id=1962738#c6