[keelerm84]

Summary

Custom FeatureStore and AsyncFeatureStore implementations must now define is_monitoring_enabled, is_available and close. Custom FeatureStoreCore and AsyncFeatureStoreCore implementations must define is_available and close. The methods are abstract, so a store that omits one cannot be instantiated. A store with no outage state can return False from is_monitoring_enabled, return True from is_available, and do nothing in close.

The SDK no longer checks whether these methods exist. CachingStoreWrapper and AsyncCachingStoreWrapper always report status monitoring as enabled and delegate is_available and close to the core. The async in-memory store's is_available is now a coroutine, to match the async interface. The Redis and Consul stores now release their connections in close.

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Note

Overview
This PR makes is_monitoring_enabled, is_available, and close required on FeatureStore / AsyncFeatureStore, and is_available / close required on the core interfaces used with caching wrappers. The SDK stops probing for optional methods with getattr/hasattr; wrappers always delegate to the underlying store/core instead.

Caching wrappers now always report monitoring as enabled and forward availability and shutdown directly. Built-in and integration stores gain concrete close behavior where needed (Redis pool disconnect, Consul HTTP session close, no-op for in-memory/DynamoDB). Async in-memory is_available is now async to match the interface.

Client lifecycle closes the feature store when FDv1/Async FDv1 stops. The sync FDv1 _FeatureStoreClientWrapper adds a write lock so close() waits for in-flight writes, ignores writes after close, and avoids starting availability pollers once closed—reducing races with status listeners that call close on failure.

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