Added global default queue type config

[SimonUnge]

Proposed Changes

A global setting for the default queue type. precedence would be x-queue-type -> vhost-default-queue-type -> config queue type -> rabbit_classic_queue

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[michaelklishin]

FTR, this was discussed with me and is just a global default for what already can be configured using virtual host metadata.

[michaelklishin]

The quorum => rabbit_quorum_queue translation can be done in a Cuttlefish translation, plus it would allow us to support arbitrary values (module names).

We already do that for the peer discovery mechanism.

[SimonUnge]

Thanks @michaelklishin , updated the code!