refactor: The first refactored version for sdk release (#907)

Co-authored-by: chengfangyin2 <chengfangyin3@jd.com>

dbgpt/util/module_utils.py

@@ -0,0 +1,28 @@
+from typing import Type
+from importlib import import_module
+
+
+def import_from_string(module_path: str, ignore_import_error: bool = False):
+    try:
+        module_path, class_name = module_path.rsplit(".", 1)
+    except ValueError:
+        raise ImportError(f"{module_path} doesn't look like a module path")
+    module = import_module(module_path)
+
+    try:
+        return getattr(module, class_name)
+    except AttributeError:
+        if ignore_import_error:
+            return None
+        raise ImportError(
+            f'Module "{module_path}" does not define a "{class_name}" attribute/class'
+        )
+
+
+def import_from_checked_string(module_path: str, supper_cls: Type):
+    cls = import_from_string(module_path)
+    if not issubclass(cls, supper_cls):
+        raise ImportError(
+            f'Module "{module_path}" does not the subclass of {str(supper_cls)}'
+        )
+    return cls