添加代码文件输出保存，创建项目文件夹，使用项目文件夹隔离

完整代码保存前，可考虑拼接全量代码再输出

metagpt/utils/save_code.py

@@ -0,0 +1,40 @@
+# -*- coding: utf-8 -*-
+# @Date    : 12/12/2023 4:14 PM
+# @Author  : stellahong (stellahong@fuzhi.ai)
+# @Desc    :
+import os
+import json
+
+from metagpt.const import DATA_PATH
+
+def save_code_file(name: str, code_context: str, file_format: str = "py") -> None:
+    """
+    Save code files to a specified path.
+
+    Args:
+    - name (str): The name of the folder to save the files.
+    - code_context (str): The code content.
+    - file_format (str, optional): The file format, supports 'py' (Python file) and 'json' (JSON file). Default is 'py'.
+
+    Returns:
+    - None
+    """
+    # Create the folder path if it doesn't exist
+    os.makedirs(name=DATA_PATH / "output" / f"{name}", exist_ok=True)
+
+    # Choose to save as a Python file or a JSON file based on the file format
+    file_path = DATA_PATH / "output" / f"{name}/code.{file_format}"
+    if file_format == "py":
+        with open(file_path, "w", encoding="utf-8") as fp:
+            fp.write(code_context + "\n\n")
+    elif file_format == "json":
+        # Parse the code content as JSON and save
+        data = {"code": code_context}
+        with open(file_path, "w", encoding="utf-8") as fp:
+            json.dump(data, fp, indent=2)
+    else:
+        raise ValueError("Unsupported file format. Please choose 'py' or 'json'.")
+
+
+
+