Docs: need to add a section on common debugging practices for Akka.NET (contributors)

[Aaronontheweb]

Please describe what you are trying to understand
I want to add a section to our documentation that explains, for developers working on contributing to Akka.NET itself, some of the common development and debugging practices designed to help make things easier.

How can we do it better?
For instance, I think it would be great if we added some advice on how to:

1. Debug racy unit tests;
2. Best practices to testing configuration changes;
3. Benchmarking Akka.NET;
4. Memory profiling Akka.NET;
5. Debugging a multi-node test;
6. Creating effective reproduction scenarios; and
7. Where various classes of network errors likely originate.

Some of those material might be equally valuable to users as well and I think we might want to consider adding a separate section that is entirely user-facing, for dealing with Akka.NET application design debugging issues.