[lldb] Handle staticmethod/classmethod descriptors in ScriptedPythonInterface

Extract `__func__` attribute from staticmethod/classmethod descriptors
before treating them as callables. Python's @staticmethod and @classmethod
decorators wrap methods in descriptor objects that are not directly usable
as PythonCallable, when calling PyCallable_Check.

The actual callable function is stored in the `__func__` attribute of these
descriptors, so we need to unwrap them to properly validate and invoke
decorated methods in scripted interfaces.

Signed-off-by: Med Ismail Bennani <ismail@bennani.ma>

Author: medismailben

lldb/source/Plugins/ScriptInterpreter/Python/Interfaces/ScriptedPythonInterface.h

@@ -81,7 +81,18 @@ class ScriptedPythonInterface : virtual public ScriptedInterface {
                               AbstractMethodCheckerCases::eNotAllocated)
       }
 
-      PythonCallable callable = callable_or_err->AsType<PythonCallable>();
+      PythonObject method_obj = *callable_or_err;
+
+      // Handle staticmethod/classmethod descriptors by extracting the
+      // `__func__` attribute.
+      if (method_obj.HasAttribute("__func__")) {
+        method_obj = method_obj.GetAttributeValue("__func__");
+        if (!method_obj.IsAllocated())
+          SET_CASE_AND_CONTINUE(method_name,
+                                AbstractMethodCheckerCases::eNotAllocated)
+      }
+
+      PythonCallable callable = method_obj.AsType<PythonCallable>();
       if (!callable)
         SET_CASE_AND_CONTINUE(method_name,
                               AbstractMethodCheckerCases::eNotCallable)