Add NIRCam WFSS simulation notebook

[bhilbert4]

This notebook shows how to create simulated NIRCam WFSS spectra for the purposes of background estimation and contamination correction.

I realize we're past the freeze date for AAS prep work, so I don't expect this PR to be merged by AAS. I just wanted to create this PR now, since I have just finished going over the notebook.

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[bhilbert4]

@camipacifici, Nor created this and I just finished going through it for a science review. So I think this is ready for technical review. No rush. I know AAS prep is in full swing. I just wanted to get this off my plate while I'm thinking about it.