Expose `lavinmq_detailed_queue_messages_(delivered|acked)_total` metrics

**Is your feature request related to a problem? Please describe.**
Currently the information on `metrics/detailed?family=queue_coarse_metrics`

**Describe the solution you'd like**
Expose all queue metrics that we can see in the Overview dashboard, as prometheus metrics and per-queue


** Use Cases **
Time in the Queue / Delay / Latency calculations like

`latency ≈ (ready + unacked) / ack_rate`