Add old walker (#4212)

* old walker

* update walker to master

* revert walker to release 3

* fix prefab

* fix obs size

* rename behavior

* camera follow

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Project/Assets/ML-Agents/Examples/Walker/Scenes/WalkerDynamic.unity

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Project/Assets/ML-Agents/Examples/Walker/Scripts/WalkerAgent.cs

     Quaternion m_WalkDirLookRot; //Will hold the rotation to our target
     
     [Header("Target To Walk Towards")] [Space(10)]
-    public Transform target; //Target the agent will walk towards.
-    public bool detectTargets; //Should this agent detect targets
-    public bool respawnTargetWhenTouched; //Should the target respawn to a different position when touched
+    public Transform target; //Target the agent will walk towards.
+    public bool detectTargets; //Should this agent detect targets
+    public bool respawnTargetWhenTouched; //Should the target respawn to a different position when touched
 
     [Header("Body Parts")] [Space(10)] public Transform hips;
     public Transform chest;

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