ENH: Example apparent magnitude uncertainty of galaxies

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Description

Write an example reproducing figure 1 in Sudek et al. 2021.

Inputs

• Rykoff model described in issue #517
• DES Y1 data from Drlica-Wagner et al. 2018

Outputs

• Example
• Plot like figure 1 in Sudek et al. 2021

References

• Sudek et al. 2021, The Sensitivity of the Redshift Distribution to GalaxyDemographics, arXiv 2112.11345
• Drlica-Wagner et al. 2018, Dark Energy Survey Year 1 Results: The Photometric Data Set for Cosmology