Support Producer and Consumer datastreams in the Kafka Integration

[ishleenk17]

Add support for the consumer and producer datastream in the Kafka Integration.
The corresponding metricsets are present in the Beats Kafa module.

[ishleenk17]

I cross-checked the beats module.
The producer metrics are not present in any of the datastreams in Integration.
We should add them.
cc: @lalit-satapathy

[lalit-satapathy]

The kafka consumer and producer metrics are based on Jolokia JMX. They monitor the Java app. These Jolokia metrics can be fetched by jolokia input also. We can add this, if needed as a priority.

But, it is slightly different from actual Kafka topics monitoring done by consumergroup and producer.