simulate imaging artifacts

Our simulated DES-like images make need to include some of these artifacts to make them sufficiently realistic.

- [ ] [cosmic rays](https://github.com/LSSTDESC/imSim/blob/main/imsim/cosmic_rays.py)
- [ ] [bleed trails](https://github.com/LSSTDESC/imSim/blob/main/imsim/bleed_trails.py)
- [ ] [vignetting](https://github.com/LSSTDESC/imSim/blob/main/imsim/vignetting.py)
- [ ] [satellite trails](https://voyages.sdss.org/preflight/locating-objects/artifacts/)
- [ ] [saturation](https://github.com/GalSim-developers/GalSim/blob/942911ffebfef8a87aaa121cf959a4b69488edd4/galsim/config/extra_badpix.py#L23)
- [ ] [brighter/fatter effect](https://github.com/GalSim-developers/GalSim/blob/942911ffebfef8a87aaa121cf959a4b69488edd4/galsim/sensor.py#L112)


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simulate imaging artifacts #731

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simulate imaging artifacts #731

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