Finish loading the vscode examples v1; Improve on the infra: Add accessibility tree into the observation; Add activate window function, etc

evaluation_examples/examples/vs_code/eabc805a-bfcf-4460-b250-ac92135819f6.json

@@ -3,20 +3,44 @@
   "snapshot": "vscode",
   "instruction": "Help me install the extension Python.",
   "source": "https://www.youtube.com/watch?v=VqCgcpAypFQ",
-  "config": [],
+  "config": [
+    {
+      "type": "launch",
+      "parameters": {
+        "command": [
+          "code"
+        ]
+      }
+    },
+    {
+      "type": "activate_window",
+      "parameters": {
+        "window_name": "Visual Studio Code"
+      }
+    }
+  ],
   "trajectory": "trajectories/eabc805a-bfcf-4460-b250-ac92135819f6",
   "related_apps": [
     "vscode"
   ],
   "evaluator": {
-    "func": "compare_answer",
-    "expected": {
-      "type": "string",
-      "string": "ms-python.python\n"
-    },
+    "func": "is_extension_installed",
     "result": {
-      "type": "command_line",
-      "command": "code --list-extensions | grep ms-python.python"
+      "type": "vm_command_line",
+      "command": [
+        "code",
+        "--list-extensions",
+        "|",
+        "grep",
+        "ms-python.python"
+      ]
+    },
+    "expected": {
+      "type": "rule",
+      "rules": {
+        "type": "contain",
+        "expected": "ms-python.python"
+      }
     }
   }
 }