add colors to draw plotly mesh object

[ShawnLJW]

Checklist

• I have searched for similar issues.
• For Python issues, I have tested with the latest development wheel.
• I have checked the release documentation and the latest documentation (for main branch).

Proposed new feature or change

The colors of a triangle mesh is ignored by o3d.visualization.draw_plotly. We could consider implementing a similar behavior to get_point_object in get_mesh_object?

def get_mesh_object(geometry,):
    triangles = np.asarray(geometry.triangles)
    vertices = np.asarray(geometry.vertices)
    if geometry.has_vertex_colors():
        vertexcolor = np.asarray(geometry.vertex_colors)
    elif geometry.has_vertex_normals():
        vertexcolor = (0.5, 0.5, 0.5) + np.asarray(geometry.vertex_normals) * 0.5
    else:
        geometry.paint_uniform_color((0.6, 0.6, 0.6))
        vertexcolor = np.asarray(geometry.vertex_colors)
    mesh_3d = go.Mesh3d(x=vertices[:, 0],
                        y=vertices[:, 1],
                        z=vertices[:, 2],
                        i=triangles[:, 0],
                        j=triangles[:, 1],
                        k=triangles[:, 2],
                        vertexcolor=vertexcolor,
                        flatshading=True,
                        lighting=dict(ambient=0.18,
                                      diffuse=1,
                                      fresnel=0.1,
                                      specular=1,
                                      roughness=0.05,
                                      facenormalsepsilon=1e-15,
                                      vertexnormalsepsilon=1e-15),
                        lightposition=dict(x=100, y=200, z=0))
    return mesh_3d

References

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Additional information

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