Feature/rag metering (#75)

* Add metering-rag for RAG token metrics

* Make metering executable

* Add metering-rag to Prom metrics

* Metricate the right queue

* Update templates to include metering-rag

prometheus/prometheus.yml

@@ -30,6 +30,7 @@ scrape_configs:
         - 'kg-extract-topics:8000'
         - 'kg-extract-relationships:8000'
         - 'metering:8000'
+        - 'metering-rag:8000'
         - 'store-graph-embeddings:8000'
         - 'store-triples:8000'
         - 'text-completion:8000'