FR: User specific dashboard and RBAC

[saya6k]

trafficstars

Having non-admin users in Fusion itself and allow them to customize their own entities can inprove Fusion.

In that way, lack of RBAC in home assistant won't be matter since Home Assistant will only serve as backend. Fusion will only serve as frontend for non-admin user.

Non-admin users can customize their dashboard with native exposed_entities feature in Home Assistant.