Set default send_batch_max_size on k8s cluster receiver #717
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Big k8s clusters with many pods cause the k8s cluster receiver to fetch metrics batches with many data points which leads to timeouts on signalfx exporter.
This change introduces a maximum limit of data points that one metrics batch can contain. Batches with more than 32k data points will be broken down in several batches.
Resolves #716