Node-RED memory cache nodes

Node-RED nodes for in-memory caching with TTL support, version 2.0.3 (stable, last updated 2021). Provides three nodes: a Cache configuration node, a Cache in node for retrieval, and a Cache out node for storage with optional TTL (in seconds). Uses node-cache under the hood, but simplifies the API for Node-RED flows. Supports cache miss routing to a separate output and dumping all cache entries. Maintenance release with minor fixes.