Sub-device concept

[planetchili]

Auto-migrated from intel-sandbox/applications.graphics.presentmonservice/issues/398

^{Original creation by planetchili on 2024-01-23 11:36:43+00:00}

Add hierarchy of devices with sub-devices. By giving CPU a device ID, cores can be represented as sub-devices. This is important because not all cores are equivalent (e.g. E-cores vs. P-cores). Could also be useful for handling graphics adapters housing multiple GPUs.