Add configuration option to configure RabbitConnectionFactory's channelRpcTimeout

[pierre-sion]

The property channelRpcTimeout is currently not configurable in RabbitAutoConfiguration via the usual spring.rabbitmq.channel-rpc-timeout property.

As a workaround, one have to either:

• provide its own RabbitConnectionFactoryBean
• use a BeanPostProcessor to invoke CachingConnectionFactory#getRabbitConnectionFactory()#setChannelRpcTimeout(int)

[jkhoward]

May I try to help out with this as part of OSD by GHC?

[mbhave]

Thanks @jkhoward. Let me know if you have any questions!

[mbhave]

Closing in favor of PR #23564.