Add pricing support for AWS CloudFormation

[hassankhosseini]

AWS Cloud Formation costs: https://aws.amazon.com/cloudformation/pricing/

aws_cloudformation_stack and aws_cloudformation_stack_set are the main resources. For each one, we can use this logic to show the cost components:

1. If template_body is set AND its "Resources.types" start with AWS::*, Alexa::*, or Custom::* then return IsSkipped: true, NoPrice: true, as it's a free resource.
2. Else, show both of these:

• "Handler operations", units "operations". Usage file param monthly_handler_operations: 10000 # Monthly number of non-free handler operations (resources outside of the AWS::*, Alexa::*, and Custom::* namespaces).
• "Durations above 30s", units "seconds". Usage file param monthly_duration_secs: 0 # Monthly duration of non-free handler operations that go above 30 seconds, in seconds.

As normal, the cost components should show cost-depends-on-usage if the usage file param is not specified.

Free resources:
aws_cloudformation_stack_set_instance
aws_cloudformation_type

[NeverovDS]

@alikhajeh1, Hey, I want to work on it!

[alikhajeh1]

@nocquidant, @miyurusankalpa, @guilhermerenew, @danielbayerlein and @RichardDRJ support for costs of CloudFormation used in Terraform projects was released in v0.9.1 today.

If you're interested in seeing Infracost process CloudFormation templates as input, please 👍 this issue