Allow to define the scope of persistent volumes

[dcvan24]

The persistent volumes declared and created with an appliance is bound within the appliance, and other appliances cannot mount and get access to it. However, persistent volumes need to be shared with other appliances in some cases (e.g., common datasets), but PIVOT does not support that.

In order to allow the volume sharing across appliances, PIVOT should allow user to define and update the scope of the persistent volumes to differentiate appliance-local and sharable volumes - volumes bound to an appliance are defined as LOCAL and those can be shared across appliances are GLOBAL.

[dcvan24]

Need to add endpoints to manage global volumes before closing this issue