feat: remove circular reference/dependency

[NedcloarBR]

LavalinkManager has NodeManager and ManagerUtils that need LavalinkManager to be instantiated but the LavalinkManager property is public so we have the circular reference/dependency problem.

LavalinkManager.NodeManager.LavalinkManager.ManagerUtils.LavalinkManager

And it goes on endlessly.
In this Issue I suggest that the LavalinkManager be private within classes that are its properties

[Tomato6966]

making something private doesn'T solve circular references

I will think of how to reduce the circular references

[appujet]

You can do

Dependency Injection After Instantiation

Or
Lazy Initialization