[Feature]: Change the namespace of SmallsOnline.AVD.ResourceManager.Models.AVD to reduce confusion

[Smalls1652]

What kind of change is this?

Change/Update

What's the description of the change?

Currently the classes for the database items is in a namespace called SmallsOnline.AVD.ResourceManager.Models.AVD. This can cause confusion with the SmallsOnline.AVD.ResourceManager.Models.Azure.DesktopVirtualization namespace and the classes inside of it.

What are the proposed changes that need to be made?

For the namespace, I'm considering changing it to SmallsOnline.AVD.ResourceManager.Models.Database since they are specifically designated for database items. As for the class names themselves, I'm not entirely too sure what I should change them to.