chore: Add type for Containers and window methods. (#660)

```
    def add_plot(
        plot_obj: GraphicsContainer,
```
```
    def add_graphics(
        graphics_obj: GraphicsContainer,
```

'''_GraphicsContainer -> GraphicsContainer```

Author: prmukherj

src/ansys/fluent/visualization/containers.py

@@ -35,7 +35,7 @@
 )
 
 
-class _GraphicsContainer:
+class GraphicsObject:
     """Base class for graphics containers."""
 
     def __init__(self, solver, **kwargs):
@@ -64,7 +64,7 @@ def __dir__(self):
         return sorted(set(super().__dir__()) | set(dir(self._obj)))
 
 
-class Mesh(_GraphicsContainer):
+class Mesh(GraphicsObject):
     """Mesh visualization object.
 
     Creates a Fluent mesh graphic object on the specified surfaces.
@@ -111,7 +111,7 @@ def __init__(
         )
 
 
-class Surface(_GraphicsContainer):
+class Surface(GraphicsObject):
     """Surface definition for Fluent post-processing.
 
     The ``Surface`` class represents any Fluent surface generated for
@@ -371,7 +371,7 @@ def __init__(
         )
 
 
-class Contour(_GraphicsContainer):
+class Contour(GraphicsObject):
     """
     Contour visualization object.
 
@@ -426,7 +426,7 @@ def __init__(
         )
 
 
-class Vector(_GraphicsContainer):
+class Vector(GraphicsObject):
     """Vector visualization object.
 
     Parameters
@@ -513,7 +513,7 @@ def __setattr__(self, attr, value):
         setattr(self._obj, attr, value)
 
 
-class Pathline(_GraphicsContainer):
+class Pathline(GraphicsObject):
     """Pathline visualization object.
 
     The ``Pathline`` class generates pathlines, which represent the trajectories
@@ -569,7 +569,7 @@ def __init__(
         )
 
 
-class XYPlot(_GraphicsContainer):
+class XYPlot(GraphicsObject):
     """XY plot visualization object.
 
     The ``XYPlot`` class creates a Fluent XY plot of a scalar field evaluated
@@ -633,7 +633,7 @@ def get_field_data(self):
         return XYPlotDataExtractor(self._obj).fetch_data()
 
 
-class Monitor(_GraphicsContainer):
+class Monitor(GraphicsObject):
     """Monitor visualization object.
 
     The ``Monitor`` class provides access to Fluent monitor data for plotting,

src/ansys/fluent/visualization/renderer.py

@@ -28,6 +28,7 @@
     PlotDefn,
 )
 import ansys.fluent.visualization as pyviz
+from ansys.fluent.visualization.containers import GraphicsObject
 from ansys.fluent.visualization.graphics import graphics_windows_manager
 from ansys.fluent.visualization.graphics.graphics_windows import _GraphicsWindow
 from ansys.fluent.visualization.plotter.plotter_windows import _PlotterWindow
@@ -58,7 +59,7 @@ class GraphicsWindow:
     >>> graphics_window.show()
     """
 
-    def __init__(self, renderer=None):
+    def __init__(self, renderer: str = None):
         """__init__ method of GraphicsWindow class."""
         self._graphics_objs = []
         self.window_id = None
@@ -68,7 +69,7 @@ def __init__(self, renderer=None):
 
     def add_graphics(
         self,
-        graphics_obj,
+        graphics_obj: GraphicsObject,
         position: tuple = (0, 0),
         opacity: float = 1,
         title: str | None = None,
@@ -96,7 +97,7 @@ def add_graphics(
 
     def add_plot(
         self,
-        plot_obj,
+        plot_obj: GraphicsObject,
         position: tuple = (0, 0),
         title: str | None = None,
         **kwargs,