Feature: adding support for RabbitMQ consistent hash exchange type

[dmitrynovik]

Why Consistent Hashing?

A RabbitMQ queue is running on at most 1 CPU core, feature of Erlang Beam VM architecture. To achieve horizontal scalability, it is advised to have multiple queues.

One variant of such topology is declaring a [Consistent Hash Exchange] (https://github.com/rabbitmq/rabbitmq-server/blob/main/deps/rabbitmq_consistent_hash_exchange/README.md):

• one exchange of type x-consistent-hash, multiple N queues, all bound to the same consistent hash exchange;
• the message is published to one above exchange but then sent exactly once by the RabbitMQ to a queue i in [0 .. N) based on the hashed routing key;
• The topology preserves message order as FIFO within each message partition [0 .. N)

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:x: dmitrynovik
:x: dmitrychilli

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