Storage allocation reporting in the general storage sub-tab in admin portal

Issue

• Currently within the Storage / General tab, 4 items are currently displayed:

Size                  : 881GB
Available             : 657GB
Used                  : 224GB
Over allocation Ratio : 0%

• For capacity planning reasons it would be useful to have another item: "Allocated", meaning the total space that has been assigned to VMs.
• The sum of the values of the "virtual size" column that is shown in the Virtual Machines sub-tab (although it only shows a few VMs - we're looking for the total here).
• We would like to know how much space has been virtually allocated to VMs, regardless of how much we are actually using (which is already shown).