Enable the queue for the Prometheus Remote Write Exporter internally (#2974)
Enable the queue for the Prometheus Remote Write Exporter internally (#2974)

* Enable queue for the Prometheus Remote Write Exporter internally

This is a follow up to #2951.

When we disable the queue completely, it causes the export to happen
not in a consumer goroutine. Enable the queue internally that export
gets its own goroutine not to block the entire collector pipeline.

* Set a default queue size
open-telemetry/opentelemetry-collector-contrib,open-telemetry/opentelemetry-collector,open-telemetry/opentelemetry-collector-contrib,open-telemetry/opentelemetry-collector,open-telemetry/opentelemetry-collector