Change MessagingEntityType to internal

[SeanFeldman]

Traditionally, this was limited to 4 entity types

1. Queue
2. Topic
3. Subscription
4. Filter

Entities would reside under Namespace.

With the new client, MessagingEntityType is adding Namespace as an entity. Is namespace truly an entity? Are different concerns mixed together?

[SeanFeldman]

Apperently, MessagingEntityType shouldn't have been made public to begin with.
Opened a separate issue (#40) for publicly exposed types.

[jtaubensee]

You are correct. We will remove namespace as there are not currently any management operations, and we can also make the MessagingEntityType enum internal.

[SeanFeldman]

👍 for internalizing the enum. It shouldn't be public.
Which should be resolved with #40, eventually.

[jtaubensee]

Marking this as a bug, to change MessagingEntityType to internal

[jtaubensee]

Closing based on #124