Add Support for `x-consistent-hash`

[tillieferguson]

Expected Behavior

Support for consistent hash exchange type, which is now supported by rabbit mq

Current Behavior

Context

[artembilan]

The contribution is welcome: https://github.com/spring-projects/spring-amqp/blob/main/CONTRIBUTING.adoc

[artembilan]

More info in: https://github.com/rabbitmq/rabbitmq-consistent-hash-exchange

[artembilan]

Well, it is possible even right now.
You just use a CustomExchange instance when declare it from the application context.
Although I still see a benefit in having a top-level API in the ExchangeBuilder.