Be able to disable metrics in producer

[bwang-abnormalsecurity]

In my profiling of a prod system, I'm seeing fairly large amount of time is used to do metrics related things (all the parts that is left of the hovered method in the screenshot) in producer's sender.

I'm wondering if there is anyway to disable that? Seems like the metrics is always created here:

kafka-python/kafka/producer/kafka.py

Line 405 in 2966a8e

self._metrics = Metrics(metric_config, reporters)

[dpkp]

I haven't found significant CPU impact from metrics subsystem. Nonetheless, I put up #2581 for you.