Feature work/kafka - Revise byte count metric

[tippmar-nr]

Exposes a RecordByteMetric() method on IAgentExperimental that reports a "proper" byte count metric that allows the NR UI to do it's magic for avg/sum/etc.

Also adds Kafka to the ArtifactBuilder components lists.

[tippmar-nr]

@nrcventura Appreciate if you'd take a look when you get time!

[nrcventura]

This looks like a better way to track the bytes metric so that all of the timeslice fields are populated. We should probably add some unit tests to cover the new code.

[codecov-commenter]

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