Add a scripts that allows to download metadata about cloud images from Cloud Image Directory and prepare them for testing via Cloud Image Validation.

• Print the supported arguments of the script:
  poetry run scripts/cid2civ --help

• Download data about Azure images:
  poetry run scripts/cid2civ download azure > cid.json

• Print a summary about the downloaded data:
  poetry run scripts/cid2civ analyze cid.json

• Generate resources for the image validation:
  poetry run scripts/cid2civ convert cid.json > civ.json

TODO

• Write tests for the script.
• Document the script.
• Install all dependencies.