[Py OV] Fix openvino.Model mocked object parameters (openvinotoolkit#…

…28313)

### Details:
- Overload `dir()` method for class objects. Add meta class `ModelMeta`
and overload `dir()`
 - Add test for checking model attributes usind `dir()`

### Tickets:
 - [CVS-160178](https://jira.devtools.intel.com/browse/CVS-160178)

---------

Signed-off-by: Alicja Miloszewska <alicja.miloszewska@intel.com>

src/bindings/python/src/openvino/_ov_api.py

@@ -22,7 +22,12 @@
 )
 
 
-class Model:
+class ModelMeta(type):
+    def __dir__(cls) -> list:
+        return list(set(cls.__dict__.keys()) | set(dir(ModelBase)))
+
+
+class Model(object, metaclass=ModelMeta):
     def __init__(self, *args: Any, **kwargs: Any) -> None:
         if args and not kwargs:
             if isinstance(args[0], ModelBase):
@@ -65,6 +70,10 @@ def __exit__(self, exc_type: Type[BaseException], exc_value: BaseException, trac
     def __repr__(self) -> str:
         return self.__model.__repr__()
 
+    def __dir__(self) -> list:
+        wrapper_methods = ["__copy__", "__deepcopy__", "__dict__", "__enter__", "__exit__", "__getattr__", "__weakref__"]
+        return dir(self.__model) + wrapper_methods
+
 
 class InferRequest(_InferRequestWrapper):
     """InferRequest class represents infer request which can be run in asynchronous or synchronous manners."""

src/bindings/python/tests/test_runtime/test_model.py

@@ -849,3 +849,11 @@ def test_tempdir_save_load_error():
         with tempfile.TemporaryDirectory() as model_save_dir:
             save_model(mem_model, f"{model_save_dir}/model.xml")
             _ = Core().read_model(f"{model_save_dir}/model.xml")
+
+
+def test_model_dir():
+    model = generate_add_model()
+    num_of_attrs = 83
+
+    assert type(dir(model)) == list
+    assert len(dir(model)) >= num_of_attrs