Consumer count does not show up in queues page for streams

[acogoluegnes]

Reported by @MarcialRosales in #3754 (comment).

[acogoluegnes]

A stream misses the consumers field. Here is the /queues endpoint result with a queue and a stream:

[
   {
      "arguments":{
         
      },
      "auto_delete":true,
      "backing_queue_status":{
         "avg_ack_egress_rate":0,
         "avg_ack_ingress_rate":0,
         "avg_egress_rate":0,
         "avg_ingress_rate":0,
         "delta":[
            "delta",
            "undefined",
            0,
            0,
            "undefined"
         ],
         "len":0,
         "mode":"default",
         "next_deliver_seq_id":0,
         "next_seq_id":0,
         "q1":0,
         "q2":0,
         "q3":0,
         "q4":0,
         "target_ram_count":"infinity",
         "version":1
      },
      "consumer_capacity":0,
      "consumer_utilisation":0,
      "consumers":0,
      "durable":false,
      "effective_policy_definition":{
         
      },
      "exclusive":false,
      "exclusive_consumer_tag":null,
      "garbage_collection":{
         "fullsweep_after":65535,
         "max_heap_size":0,
         "min_bin_vheap_size":46422,
         "min_heap_size":233,
         "minor_gcs":7
      },
      "head_message_timestamp":null,
      "memory":42520,
      "message_bytes":0,
      "message_bytes_paged_out":0,
      "message_bytes_persistent":0,
      "message_bytes_ram":0,
      "message_bytes_ready":0,
      "message_bytes_unacknowledged":0,
      "message_stats":{
         "ack":433,
         "ack_details":{
            "rate":0
         },
         "deliver":433,
         "deliver_details":{
            "rate":0
         },
         "deliver_get":433,
         "deliver_get_details":{
            "rate":0
         },
         "deliver_no_ack":0,
         "deliver_no_ack_details":{
            "rate":0
         },
         "get":0,
         "get_details":{
            "rate":0
         },
         "get_empty":0,
         "get_empty_details":{
            "rate":0
         },
         "get_no_ack":0,
         "get_no_ack_details":{
            "rate":0
         },
         "publish":434,
         "publish_details":{
            "rate":0
         },
         "redeliver":0,
         "redeliver_details":{
            "rate":0
         }
      },
      "messages":0,
      "messages_details":{
         "rate":0
      },
      "messages_paged_out":0,
      "messages_persistent":0,
      "messages_ram":0,
      "messages_ready":0,
      "messages_ready_details":{
         "rate":0
      },
      "messages_ready_ram":0,
      "messages_unacknowledged":0,
      "messages_unacknowledged_details":{
         "rate":0
      },
      "messages_unacknowledged_ram":0,
      "name":"amq.gen-90W-hp4Nx28Y6QDivWwV9Q",
      "node":"rabbit@d3c03206804f",
      "operator_policy":null,
      "policy":null,
      "recoverable_slaves":null,
      "reductions":6423,
      "reductions_details":{
         "rate":0
      },
      "single_active_consumer_tag":null,
      "state":"running",
      "type":"classic",
      "vhost":"/"
   },
   {
      "arguments":{
         "x-max-length-bytes":20000000000,
         "x-queue-leader-locator":"least-leaders",
         "x-queue-type":"stream",
         "x-stream-max-segment-size-bytes":500000000
      },
      "auto_delete":false,
      "durable":true,
      "effective_policy_definition":{
         
      },
      "exclusive":false,
      "members":[
         "rabbit@d3c03206804f"
      ],
      "memory":9184,
      "messages":8414,
      "messages_details":{
         "rate":100.4
      },
      "messages_ready":8414,
      "messages_ready_details":{
         "rate":100.4
      },
      "messages_unacknowledged":0,
      "messages_unacknowledged_details":{
         "rate":0
      },
      "name":"stream",
      "node":"rabbit@d3c03206804f",
      "online":[
         "rabbit@d3c03206804f"
      ],
      "operator_policy":null,
      "policy":null,
      "readers":{
         "rabbit@d3c03206804f":1
      },
      "reductions":0,
      "reductions_details":{
         "rate":0
      },
      "state":"running",
      "type":"stream",
      "vhost":"/"
   }
]