stream create policy for messagettl

[bithckr]

The amqp091 provider should create a user policy when the MessageTTL is provided by the client. This allows clients to change this in the future because you can not if this is set on Declare.

[dlawregiets]

Does the policy apply to just that stream? What priority will we apply? Is there a limit to the number of policies that rabbit can handle?

We will need to remember to delete policies when we update the pruner if policies are specific to individual streams.

[bithckr]

Yes, this will apply to just that stream. RabbitMQ does not have a limit on policies, but their are performance concerns. I think we should use a pretty high priority. User policies do not impact our ability to apply a global policy.

[bithckr]

I updated the pruner ticket to look out for user policies.