Adding support to new topology to the command line tool

[SzymonPobiega]

Adds support to new topology to the command line tool. New usage:

• Create infrastructure for a new endpoint using topic-per-event-type topology

endpoint create MyEndpoint

• Create infrastructure for a new endpoint using legacy migration topology (includes creating the bundle topic and a subscription)

migration endpoint create MyEndpoint

• Subscribe / unsubscribe using the topic-per-event-type topology

endpoint subscribe MyEndpoint MyEvent
endpoint unsubscribe MyEndpoint MyEvent

• Subscribe / unsubscribe using the legacy migration topology

migration endpoint subscribe MyEndpoint MyEvent
migration endpoint unsubscribe MyEndpoint MyEvent

• Subscribe / unsubscribe using the topic-per-event-type topology in a migration endpoint

migration endpoint subscribe-migrated MyEndpoint MyEvent
migration endpoint unsubscribe-migrated MyEndpoint MyEvent

[SzymonPobiega]

@danielmarbach this is now in the form that I think is ready for a review.

[danielmarbach]

I'm wondering if it wouldn't be better to have a more drastic approach with the tooling by moving everything migration related underneath a command.
So basically, you can continue using endpoint create, but that does it in the topic-per-event type way and if you want to access the "old commands" you have to do "migrate create" or migrate subscribe etc. which that it would also follow more logically what we have in the transport, and it is better optimized for removal because you can delete an entire command tree when migration is no longer supported