Feature request - public `registry._names_to_collectors` access

Now we are working on Prometheus support in FastStream and faced with a problem. Shared registry between different middlewares leads to MetricsContainer duplication. So, we would like to have a public API to chech registry for already registered objects.

Can you please provide public access to this property some way?

https://github.com/prometheus/client_python/blob/master/prometheus_client/registry.py#L31

I think, the easiest way to save old API and provide us with a new one - add a public property like in the following snipper

class CollectorRegistry(Collector):
    def __init__(self):
        self._names_to_collectors: Dict[str, Collector] = {}

    @property
    def names_to_collectors(self):
        return self._names_to_collectors

Commencez dans prometheus_client/registry.py, au niveau de CollectorRegistry et de sa propriété _names_to_collectors, comme indiqué dans l’issue. Examinez la manière dont le registre est utilisé et identifiez les implications de compatibilité d’un accès public. Le travail est considéré comme terminé lorsqu’un moyen public pris en charge d’inspecter les objets enregistrés est fourni sans supprimer l’attribut interne existant.