Benchmark models and differences versus California County Models

[isaacmg]

Based on the results of #53 we want to compare results for our best models and their ability to accurately forecast versus California models. We also want to highlight our methodological differences and how our approach can enhance forecast versus California models

Acceptance criteria

• Utilize California models to back-test on May 30-Jun-14.
• Compare MSE of our best models versus California models
• Write Wandb report to show difference between the two models.

[antonpolishko]

Also related links: https://calcat.covid19.ca.gov/cacovidmodels/
https://github.com/StateOfCalifornia/CalCAT