feat(CO2): implement carbon footprint data in cloud pricing api

[fabienzucchet]

This PR updates the cloud-princing-api service to return carbon footprint data at the same time as the price if available so that the data can be displayed in infracost CLI (see this related PR. In order to do so, the following changes have been made:

• Add a column in database to store the unit carbon footprint for each product
• Add a new resolver to return the carbon footprint when the price for a product is returned
• Add a way to insert the carbon footprint data in the database:
  • a script dataPatchEmissions that inserts the know values in the database
  • a JSON file containing the first values computed (see this article explaining the methodology