Missing http metrics in the querier.

When using the query-frontend, querier actually are queried without the http server and this means we're missing http metrics for all calls to queriers.

We should be able to a metrics middleware there https://github.com/grafana/pyroscope/blob/main/pkg/querier/grpc_handler.go#L9

If possible we should use the same as the http server here https://github.com/grafana/pyroscope/blob/main/pkg/phlare/modules.go#L425

However that seems hards seems it relies on http registration to match routes and those seems to not happen in that case.