Task: Add a name field for event hubs and consumer groups

[szoio]

Add a name field for event hubs and consumer groups.

As event hub names are scoped by event hub namespace, and consumer group names are scoped by event hubs, there needs to be name field to reflect this, rather than use the kubernetes resource names (that impose uniqueness contraints across the cluster).
For example, it should be possible to create a consumer group with the same name, e.g. test_consumer for each of the event hubs.

**Done criteria **
This is the "done" criteria for this task

• User can create eventhub resources that are unique for the scope that it is in, rather than cluster-wide scope.

User story reference*

#221

[frodopwns]

this would be more esily fixed by deploying resources you want to have the same name to different namespaces