KAFKA-19791: Add Idle Thread Ratio Metric to MetadataLoader #20724
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This change adds the metric
MetadataLoader::AvgIdleRatio, following the same pattern as the existingControllerEventManager::AvgIdleRatiometric.This metric measures the average idle ratio of the metadata loader event queue thread, indicating how much time the metadata loader spends waiting for events versus actively processing them. The metric value ranges from 0.0 (always busy processing) to 1.0 (always idle waiting for events).