Open3D Renderer Python Binding: allow controlling interpolation method

**Is your feature request related to a problem? Please describe.**
I would like to set the interpolation_method of the Render Option from Python. It is important for our use case, as the default nearest_neighbour is not satisfactory.

**Describe the solution you'd like**
https://github.com/isl-org/Open3D/blob/master/cpp/pybind/visualization/renderoption.cpp - pybind allows setting interpolation_method from https://github.com/isl-org/Open3D/blob/master/cpp/open3d/visualization/visualizer/RenderOption.h.

**Describe alternatives you've considered**
renderer.get_render_option() doesn't have interpolation attribute. Has background_color etc as defined in binding.

**Additional context**
Add any other context or screenshots about the feature request here.