Use with external CloudFront resource

[ofhouse]

Currently the main CloudFront resource is created & managed by the module itself.
While this is great as a quick setup for new users, it can become difficult for advanced use cases to integrate the module into an existing setup.

So we should switch to a similar approach as we did on the image optimizer module:

• Create a managed CloudFront distribution by default (Quick setup)
• Prevent creation of CloudFront distribution and export all configuration (Cache & Origin Policies), so that it can be integrated into an existing CloudFront Distribution

ToDo

• Rework Custom Domain Example to use external CloudFront distribution

[chamilad]

Thanks for introducing this feature! In my case I found that certain changes (ex: resource names) could recreate CF distribution and I have to update naming manually each time my pipeline runs. This decoupling helps to keep that constant.