Why hangfire not use meter for metrics

Now we have metrics in dashboard, but if we want reuse this metrics in our alerts, we have to write our custom metrics, but if hangfire moves to microsoft class Meter, we can reuse it for our alerts

As example, for npgsql we just write
```
builder
.AddMeter(DiagnosticsConfig.DefaultMeterName)
.AddMeter("Npgsql")
```

No files, tests, or entry points are named. Begin by reviewing how Hangfire's existing dashboard metrics are produced and compare the requested Microsoft Meter approach with the Npgsql AddMeter example. Done means Hangfire metrics can be consumed by application alerts through Meter registration without custom metrics.

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