Add logger to the consumers

[Bernardo-MG]

Currently the messages which go through the consumer, both the received message and the sent one, are not being logged.

I can't find any way to log them directly, and the few examples about this just add loggers to all the possible protocols loggers.

For example, if the consumer sends the message through HTTP the examples use:

<AsyncLogger name="org.mule.module.http.internal.HttpMessageLogger" level="DEBUG"/>