AWS::CloudFront::Distribution *CacheBehavior* as an independant resource

## Title
AWS::CloudFront::Distribution **CacheBehavior** : independant resource

## Scope of request
Possibility of reducing the size of AWS::CloudFront::Distribution **DistributionConfig** property by leaving the object AWS::CloudFront::Distribution **CacheBehavior** as an independant resource

## Why ?

- Remove templates for CloudFront service with more than +1K lines
- facilitate the maintenance of the property AWS::CloudFront::Distribution **DistributionConfig**
- use the module concept: [announcing-modules-for-aws-cloudformation](https://aws.amazon.com/about-aws/whats-new/2020/11/announcing-modules-for-aws-cloudformation/)
...

[AWS::CloudFront::Distribution **DistributionConfig**](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-cloudfront-distribution-distributionconfig.html)