Add details for error messages in validate_pipeline_descriptor_sets

[ComfyFluffy]

Add details for format and image_view_type checks in RecordingCommandBuffer::validate_pipeline_descriptor_sets to make debugging easier.

[Rua]

Thanks, I agree that this helps. Maybe the messages would be clearer still if the message said "pipeline requires X, but image view type is Y", instead of "expected" and "found"? Then there's no doubt on what pieces are referred to.