graphq: Configure the statsd properties to have the metrics in prometheus

Related to swh/infra/sysadm-environment#4804 (closed)

/cc @teams/sysadmin

It does not add a lot of exploitable metrics but it's a beginning:

swh_graphql_query_seconds_sum
swh_graphql_query_seconds_bucket
swh_graphql_query_seconds_count