Enhancement to disks reporting tab

As with the dashboard (feature request #58401), the "disks" reporting tab could do with somew small enhancement.

There are three problems that make this tab hard to get benefit from:

There isn't a way to get info at vdev/pool level, only at disk level
There is also a usability issue - more than 2-3 disks quickly creates many many graphs, most of which can't be seen on the same page.

As a basic fix, this might help a lot:

Add vdev/pool level stats reporting - either as part of the disk page or a separate page. There are just too many stats that are important but can't be seen disk by disk, but only for the vdev or pool as a whole. (The "partition" tab gives data space used, but not pool stats, by which I include things like latency/IO/IOPS)
Add an option to generate large/medium/small graphs, and to align them in a tabular style (as opposed to a list style), with metrics left to right and devices top to bottom, so you can easily and quickly compare across devices by eye.