PY-34617 Move getClassAttributes(), getOwnSlots() from PyAstClass

GitOrigin-RevId: 39ee4f79543a35fc696f9c754f5c5cf89b711f63

python/python-psi-api/src/com/jetbrains/python/psi/PyClass.java

@@ -211,12 +211,7 @@ public interface PyClass extends PyAstClass, PsiNameIdentifierOwner, PyCompoundS
    *
    * @see #getClassAttributesInherited(TypeEvalContext)
    */
-  @Override
-   default List<PyTargetExpression> getClassAttributes() {
-    //noinspection unchecked
-    return (List<PyTargetExpression>)PyAstClass.super.getClassAttributes();
-  }
-
+  List<PyTargetExpression> getClassAttributes();
 
   /**
    * Returns all class attributes this class class contains, including inherited one.
@@ -295,6 +290,15 @@ public interface PyClass extends PyAstClass, PsiNameIdentifierOwner, PyCompoundS
   @Nullable
   List<String> getSlots(@Nullable TypeEvalContext context);
 
+  /**
+   * Returns the list of names in the class' __slots__ attribute, or null if the class
+   * does not define such an attribute.
+   *
+   * @return the list of names or null.
+   */
+  @Nullable
+  List<String> getOwnSlots();
+
   /**
    * Process all declarations appearing at the syntactic level of this class' body, in particular class attributes, both
    * assignments and type declarations, methods, and nested classes.