pull metrics script into spreadsheet

[lionel-nj]

Could be done using gcp: github -> script -> gcp -> google sheet

Pricing information for google cloud function usage: https://cloud.google.com/functions/pricing

[lionel-nj]

https://github.com/MobilityData/metrics/pull/7 comes along with the implementation of a pipeline using Google Cloud Platform that allows generation of charts in this spreadsheet:

• web export: https://docs.google.com/spreadsheets/d/e/2PACX-1vRNJF878YRTiP1kJ5I2smgXBevWuXB7WOe1HsRy_CtHrP8czMNv1qnw1pT4KYNJEUFqV1utNpSRSC6p/pubhtml
• google spreadsheet: https://docs.google.com/spreadsheets/d/1jqk1SHYIoAfv2JriNBapkHn7zOlZ4K7QDqQbQChBgDU/edit#gid=942071232