Update configuration on the fly

I was looking for an issue about changing configuration without having to redeploy the service. I didn't find any existing issue about that, but I found this TODO comment in `ServiceFabricDiagnosticPipelineFactory`:

https://github.com/Azure/diagnostics-eventflow/blob/3628217bf9960392716a935a7ee7d33611bb0462/src/Microsoft.Diagnostics.EventFlow.ServiceFabric/ServiceFabricDiagnosticPipelineFactory.cs#L32

I'm thinking about some kind of integration with our custom ConfigurationService, so it would be of great help if the official solution had support for updating configuration on the fly, to get an idea of what's needed.