feat: more lambda config options

[leonard-henriquez]

Added new features to make the Lambda terraform config more versatile:

• Use the new cache policy system (since the previous is deprecated)
• Use the new cors policy system (deprecated + and did not forward the right headers)
• Remove geo_restriction because it is specific, not documented and hard to debug
• Add aws_access_key / aws_secret_key for easier setup
• Allow to use custom buz_source_image
• bug fix: with build_number = var.buz_version, I have an error because the docker login only last a few hours so it needs to run every time -> my solution isn't very clean but I'm not really a pro in Terraform so tell me if you have a better solution !

[jakthom]

Looks good - one small fix re: aws named profiles requested.