Add save/load methods to anomaly detection classes#3130
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Checklist before merging this PR:
Fixes #3051.
Summary
Adds
save()andload()methods to the four anomaly detection base classes (AnomalyScorer, Detector, Aggregator, AnomalyModel). This makes it possible to persist trained scorers like KMeansScorer, detectors like QuantileDetector, aggregators, and anomaly models to disk and reload them later without retraining. Uses the same pickle-based approach as ForecastingModel.save/load.Other Information
All subclasses inherit save/load automatically. The full anomaly detection test suite passes (229 tests).