{Code Sample} Offscreen rendering using pyrender

Summary:
Introduce a code sample to perform offscreen rendering using PyRender.
- Use PyRender Scene to setup:
  - 3D object meshes and poses
  - Rectilinear cameras corresponding to Aria Glasses camera poses
  - Hand mesh
- Perform offscreen rendering to retrieve COLOR/DEPTH/Segmentation masks
- Show how to map the rectilinear image back to the native FishEye camera model (do note that we are loosing some field of view)

Example of usage:
1. install deps
`pip install pyrender trimesh`
2. Run the code sample
`python render_3.py`

See the rendered images in the folder

Reviewed By: prithvirb

Differential Revision: D64411691

fbshipit-source-id: 5c5ab2e42ce6ab9c67c47c9cbe9b3449e8d1cbff