Task: Generate types from CloudFormation resource registry schemas

[lwoggardner]

With new 3rd party types being defined in the the cloudformation registry, CfnDSL should be able to use these type schemas either dynamically (requires AWS creds) or offline (from a directory of schema files) and then create DSL objects.

One issue is that the prefix for types can now be a 3rd party. ie EC2_Instance is actually AWS::EC2::Instance and now we have possibility of Provider::ResourceCategory::Resource presumably becoming method Provider_ResourceCategory_Resource.

https://docs.aws.amazon.com/cloudformation-cli/latest/userguide/resource-type-schema.html