Add vector flag of agent's frozen state to VisualFoodCollector (#4511)

VisualFoodCollector is now an example environment of using a mix of visual and vector observation and is able to train with default config file.

Co-authored-by: Vincent-Pierre BERGES <[email protected]>

Author: Ruo-Ping (Rachel) Dong

Project/Assets/ML-Agents/Examples/FoodCollector/Prefabs/VisualFoodCollectorArea.prefab

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