Add IsHot method to metricMiddleware

Added a new method IsHot to the metricMiddleware struct in the tweetfinder to determine if a tweet stream is trending. This addition allows for more effective monitoring and prioritization of trending tweet streams, enhancing system performance and responsiveness.

internal/tweetfinder/metrics_middleware.go

@@ -18,6 +18,10 @@ type metricMiddleware struct {
 	findRequestsHistogramSeconds     *prometheus.HistogramVec
 }
 
+func (m *metricMiddleware) IsHot() bool {
+	return m.next.IsHot()
+}
+
 func (m *metricMiddleware) CurrentTemp(ctx context.Context) float64 {
 	return m.next.CurrentTemp(ctx)
 }