add scripts testing full scene drawing residuals+timing

[ismael-mendoza]

for the jax galsim first paper we are interested in investigating the performance of drawing actual galaxy scenes with jax-galsim, not stamps, and compare the performance GalSim both on CPU and GPU.

We are thinking:

• ~ 100x100 pixel images
• use the CATSIM catalog like descwl-shear-sims, use Spergel profiles for Bulges since we don't have DeVacouleurs profile implemented.
• use Moffat profile (need to solve moffat profile drawing is slow #161 first)
• draw Sum object directly rather than adding each object one at a time to the image, do the same in GalSim