feat: Implement AbstractAsyncFeatureCache for async SDK clients #80
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This PR introduces asynchronous feature caching support, which is critical for the asynchronous operation mode of the SDK (
GrowthBookClient). Utilizing an async cache (e.g., Redis) significantly reduces latency and API load by eliminating the need for HTTP requests during a Cache HIT.Changes
AbstractAsyncFeatureCache: Defined the interface for asynchronous caching, including methods likeget(key),set(key, value, ttl).FeatureRepository: Theload_features_asyncmethod now utilizesself.async_cache(if provided inOptions) to check and store features in the cache.