Possible change for some JMS metrics for prometheus

This is not a bug, just an observation of something minor we may want to change for consistency.

I see these family names for JMS topics:

wildfly_messaging_durable_message_count
wildfly_messaging_durable_subscription_count
wildfly_messaging_non_durable_message_count
wildfly_messaging_non_durable_subscription_count

This sort of conflicts with the way we have, say, jvm_memory_bytes_max with label area=heap|nonheap. We could extract the persistence into a label:

wildfly_messaging_message_count

{persist="durable|nondurable"}
wildfly_messaging_subscription_count{persist="durable|nondurable"}

or some other similar labeling scheme.