Enhance GIMP metrics evaluator with logging and transparency handling

- Replaced print statements with logging for better traceability in gimp.py.
- Added handling for transparent images in structure checks and size evaluations.
- Updated JSON examples to include delays in pyautogui commands for improved execution reliability.
- Changed image URL in example to a more accessible source.

evaluation_examples/examples/gimp/a746add2-cab0-4740-ac36-c3769d9bfb46.json

@@ -9,7 +9,7 @@
             "parameters": {
                 "files": [
                     {
-                        "url": "https://agent-files.deva.msh.team/osworld/benchmark_files/gimp/a746add2-cab0-4740-ac36-c3769d9bfb46_dog_with_background.png",
+                        "url": "https://huggingface.co/datasets/xlangai/ubuntu_osworld_file_cache/resolve/main/gimp/a746add2-cab0-4740-ac36-c3769d9bfb46/dog_with_background.png",
                         "path": "/home/user/Desktop/dog_with_background.png"
                     }
                 ]
@@ -37,7 +37,7 @@
                     "command": [
                         "python3",
                         "-c",
-                        "import pyautogui; pyautogui.press([\"esc\"]);pyautogui.hotkey([\"ctrl\", \"q\"]);"
+                        "import time; import pyautogui; pyautogui.press([\"esc\"]);time.sleep(1);pyautogui.hotkey([\"ctrl\", \"q\"]);time.sleep(1);"
                     ]
                 }
             },
@@ -47,7 +47,7 @@
                     "command": [
                         "python3",
                         "-c",
-                        "import pyautogui; pyautogui.press([\"right\"]);pyautogui.press([\"enter\"]);"
+                        "import time; import pyautogui; pyautogui.press([\"right\"]);time.sleep(1);pyautogui.press([\"enter\"])"
                     ]
                 }
             },