Partitions should be supported

[AmazingPangWei]

At present, hwameistor is disk-oriented, but in some cases, this does not apply.

For example: I got a k8s cluster running on a laptop, while the laptops usually own only one disk. And I can't use disk partitions, even though partitions have a lot of capacity.

Maybe we should come up with a solution for covering this case.

[github-actions]

This issue has been marked as stale because it has been open for 90 days with no activity. This thread will be automatically closed in 30 days if no further activity occurs.

[SSmallMonster]

work-around docs: https://hwameistor.io/docs/faqs#q6-how-to-expand-the-storage-pool-manually