Load automatically all DiagnosticSources for current application

[glucaci]

Resolve per convention entry assembly name prefix (e.g. MyProduct.MyaApp) and add it to allow prefixed on the session, to enable all application specific diagnostic sources without configuration.

Afterwords user can still use configuration for additional diagnostic sources which he wants to trace.

Maybe for resolver user can pass regex for extracting the prefix from assembly name, to don't have to strict convention on assembly name.