Upgrade to azure-mgmt-servicebus:1.12.0

[alfanse]

I noticed there is a scarcity of information about how to manage topics / queues with the new azure-mgmt-servicebus library mentioned here: https://github.com/Azure/azure-service-bus-java

api doc - https://docs.microsoft.com/en-us/java/api/com.microsoft.azure.management.servicebus?view=azure-java-stable

mavencentral - https://mvnrepository.com/artifact/com.microsoft.azure/azure-mgmt-servicebus

It would be great if you could upgrade this samples project to show how to drive that new api.
Many thanks