[improvement] Prometheus instrument should drop "infras related tags"

[soloradish]

In
https://github.com/soketi/pws/blob/5f3979ebd305d4a54cc5463b9f1250906bb79167/src/metrics/prometheus-metrics-driver.ts#L7

interface PrometheusMetrics {
    connectedSockets?: prom.Gauge<'app_id'|'node_id'|'pod_id'>;
    newConnectionsTotal?: prom.Counter<'app_id'|'node_id'|'pod_id'>;
    newDisconnectionsTotal?: prom.Counter<'app_id'|'node_id'|'pod_id'>;
    socketBytesReceived?: prom.Counter<'app_id'|'node_id'|'pod_id'>;
    socketBytesTransmitted?: prom.Counter<'app_id'|'node_id'|'pod_id'>;
    httpBytesReceived?: prom.Counter<'app_id'|'node_id'|'pod_id'>;
    httpBytesTransmitted?: prom.Counter<'app_id'|'node_id'|'pod_id'>;
    httpCallsReceived?: prom.Counter<'app_id'|'node_id'|'pod_id'>;
}

app's instrument should not have infras related tags, leave these to discovery & relabel phase.

connectedSockets?: prom.Gauge<'app_id'>; will be enough.