Roma Frolov

Feature: Prometheus Middleware to collect metrics

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To improve Observability in FastStream, Prometheus Middleware support is needed. Suggested metrics: - number of messages received; - ack quantity; - nack quantity; - reject quantity; - number of unprocessed...

# Description Implemented Prometheus middleware for all brokers. It seems to me that the getting-started documentation for prometheus middlewares (index.md) is not entirely complete. I would be glad to receive...