CSV for chloropleth maps

[MGMD-96]

Create code that generates this csv file along with all other files. This code will go into the unified code only.

The generated csv will be linked to various choropleth data viz maps.

Properties of csv: https://github.com/CovidToday/backend/blob/master/Datawrapper%20Chloropleth%20Rt.csv
First row headers.
First column has to be states names (NOT state codes).
Rest columns need to MOST RECENT DATA for that metric.

Various metrics that go in separate columns:

• Rt
• daily cases per million
• daily test posrate moving avg
• daily tests per million
• CFR