crawler: add time reward

Project/Assets/ML-Agents/Examples/Crawler/Prefabs/Crawler.prefab

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Project/Assets/ML-Agents/Examples/Crawler/Scenes/CrawlerStaticTarget.unity

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+    - target: {fileID: 3386028169665032405, guid: 1b9d167a4e71146a883212e4f08bda88,
+        type: 3}
+      propertyPath: m_ConnectedAnchor.x
+      value: 0.2828369
+      objectReference: {fileID: 0}
+      objectReference: {fileID: 0}
+    - target: {fileID: 3386028169836750752, guid: 1b9d167a4e71146a883212e4f08bda88,
+        type: 3}
+      propertyPath: m_ConnectedAnchor.x
+      value: -0.2828369
       objectReference: {fileID: 0}
     - target: {fileID: 3386028169838659253, guid: 1b9d167a4e71146a883212e4f08bda88,
         type: 3}
+    - target: {fileID: 3386028169838659253, guid: 1b9d167a4e71146a883212e4f08bda88,
+        type: 3}
+      propertyPath: m_ConnectedAnchor.x
+      value: 0.2828369
+      objectReference: {fileID: 0}
+      objectReference: {fileID: 0}
+    - target: {fileID: 3386028170461648232, guid: 1b9d167a4e71146a883212e4f08bda88,
+        type: 3}
+      propertyPath: m_ConnectedAnchor.x
+      value: -0.2828369
       objectReference: {fileID: 0}
     - target: {fileID: 3386028170626051599, guid: 1b9d167a4e71146a883212e4f08bda88,
         type: 3}

Project/Assets/ML-Agents/Examples/Crawler/Scripts/CrawlerAgent.cs

     /// </summary>
     void RewardFunctionTimePenalty()
     {
-        AddReward(-0.001f);
+        AddReward(0.0001f);
     }
 
     /// <summary>

Project/Assets/ML-Agents/Examples/OldCrawler/Prefabs/OldCrawler.prefab

   agentParameters:
     maxStep: 0
   hasUpgradedFromAgentParameters: 1
-  MaxStep: 1000
+  MaxStep: 5000
   target: {fileID: 0}
   ground: {fileID: 0}
   detectTargets: 0
   leg3Lower: {fileID: 3650911777174035777}
   rewardMovingTowardsTarget: 1
   rewardFacingTarget: 1
-  rewardUseTimePenalty: 0
+  rewardUseTimePenalty: 1
   useFootGroundedVisualization: 0
   foot0: {fileID: 0}
   foot1: {fileID: 0}

Project/Assets/ML-Agents/Examples/OldCrawler/Scripts/OldCrawlerAgent.cs

     /// </summary>
     void RewardFunctionTimePenalty()
     {
-        AddReward(-0.001f);
+        AddReward(0.0001f);
     }
 
     /// <summary>