loki operator currently create http and grpc endpoints for distributor

We could try to implement a grpc client in this stage and compare the performances.

Check:

https://github.com/grafana/loki/tree/main/clients/cmd/fluent-bit#fluent-bit-output-plugin

If GRPC is not suitable, investigating keealive connections in the current loki client, which is disabled by default and can't be configured.