Add batched exports to the Prometheus Remote Write Exporter #2249
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Description:
Currently, there is no limit on the size of the remote_write export request to a Cortex instance. This could create problems if one Prometheus scrape produces an extreme amount of timeseries metrics.
This PR creates a batch of concurrent requests where the max size of a request is 3MB and the max number of timeseries per request is 40,000.
A future PR will tackle making the max size of each request configurable.
Testing: