Use app LRU, not functools LRU decorator, to cache search results in router

- Provides more control to invalidate cache on update to entries, embeddings
- Allows logging when results are being returned from cache etc
- FastAPI, Swagger API docs look better as the `search' controller not
  wrapped in generically named function when using functools LRU decorator

src/configure.py

@@ -88,6 +88,9 @@ def configure_search(model: SearchModels, config: FullConfig, regenerate: bool,
             search_config=config.search_type.image,
             regenerate=regenerate)
 
+    # Invalidate Query Cache
+    state.query_cache = {}
+
     return model