layers: Add cmd buffer binding for descriptor resources

layers: Add cmd buffer binding for descriptor resources

This commit creates bindings between a cmd buffer and the images/buffers
and their memory allocations that are tied to that cmd buffer's active
descriptor slots (set/binding combination).
The active resources are anything that's in use during any of the draws
issued in the cmd buffer.
If any of the bound resources are deleted, the cmd buffer will become
invalid and an error will be issued on the next attempt to submit it.