Add Getter for ExchangeInfo dto to access ExchangeMessageStats

[ekonopaka]

When doing a get for rabbitmq exchanges in the client we receive ExchangeInfo.
This is good and comprehensive dto object with lots of information.

However in my particular case I need to access ExchangeMessageStats for some more insights.
But for some reason messageStats is a private field with no getter. ExchangeMessageStats is a public class so I assumed it to have public getter inside ExchangeInfo.

Could you please add this getter to ExchangeInfo.ExchangeMessageStats?

[michaelklishin]

Pretty sure you mean Hop and not the AMQP 0-9-1 Java client. You are welcome to submit a PR. I can't think of a reason to not expose the stats.

[ekonopaka]

thanks, yes, hop. I'll make a PR

[acogoluegnes]

Fixed in #340.