Added progress bar when running visualizer

com.unity.perception/Editor/Visualizer/VisualizerInstaller.cs

 
             var (pythonPid, port, visualizerPid) = ReadEntry(project);
 
+            EditorUtility.DisplayProgressBar("Opening Visualizer", "Checking if instance exists", 0.5f / 4);
+                EditorUtility.DisplayProgressBar("Opening Visualizer", "Opening", 4f / 4);
+                EditorUtility.ClearProgressBar();
             }
             //Otherwise delete any previous entry for this project and launch a new process
             else
 
+                EditorUtility.DisplayProgressBar("Opening Visualizer", "Running executable", 1f / 4);
+                    EditorUtility.ClearProgressBar();
+
+                EditorUtility.DisplayProgressBar("Opening Visualizer", "Finding Visualizer instance", 2f / 4);
                 var newVisualizerPid = -1;
                 var attempts = 0;
                 while(newVisualizerPid == -1)
                     if(attempts == maxAttempts)
                     {
                         Debug.LogError("Failed to get visualizer ID");
+                        EditorUtility.ClearProgressBar();
                         return;
                     }
                     attempts++;
+                EditorUtility.DisplayProgressBar("Opening Visualizer", "Finding Streamlit instance", 3f / 4);
                 var newPythonPid = -1;
                 attempts = 0;
                 while(newPythonPid == -1)
                     if(attempts == maxAttempts)
                     {
                         Debug.LogError("Failed to get python ID");
+                        EditorUtility.ClearProgressBar();
                         return;
                     }
                     attempts++;
+                EditorUtility.DisplayProgressBar("Opening Visualizer", "Finding Port", 3.5f / 4);
                 var newPort = -1;
                 attempts = 0;
                 while(newPort == -1)
                     if(attempts == maxAttempts)
                     {
                         Debug.LogError("Failed to get PORT");
+                        EditorUtility.ClearProgressBar();
                         return;
                     }
                     attempts++;
                     LaunchBrowser(newPort);
                 }*/
 
+                EditorUtility.DisplayProgressBar("Opening Visualizer", "Opening", 4f / 4);
+                EditorUtility.ClearProgressBar();
 
             }
         }