metrics support for the circuit breaker

[gourish25]

Currently, the circuit breaker does not expose any metrics. This makes it difficult to observe its behavior in production—such as how often it opens, how many requests are rejected, or whether failures are transient or persistent. Without metrics, troubleshooting service instability and validating circuit breaker configuration (thresholds, intervals) becomes difficult .

Expose standard, observable metrics for the circuit breaker that can be scraped by monitoring systems (e.g., Prometheus).

below is the code sniper where I have added circuit breaker