Better structure of Client "session" and subscription code

[marcschier]

Type of issue

• Bug
• Enhancement
• Compliance
• Question
• Help wanted

Current Behavior

Flat list mixes managed and unmanaged session, monitored items at same level as subscriptions.

Expected Behavior

More structure to see what code belongs to which area.

Steps To Reproduce

No response

Environment

- OS:
- Environment:
- Runtime:
- Nuget Version:
- Component:
- Server:
- Client:

Anything else?

No response