add action for prometheus compliance tests (#5739)
add action for prometheus compliance tests (#5739)

This change imports and runs the official Prometheus Remote Write compliance tests from https://github.com/prometheus/compliance against a live collector as a GitHub action.

Fixes open-telemetry/wg-prometheus/issues/34
open-telemetry/opentelemetry-collector-contrib,open-telemetry/opentelemetry-collector-contrib