7.0.0 - Refactored `container_definitions`

What's Changed

• Refactored container definitions out of module by @Ohid25 in #69

Potentially Breaking Changes

This applies only if you want to migrate to using external container definitions and are migrating from ~> 6.7.0 to ~> 7.0.0

With the introduction of using an external container definitions module to manage, cloudwatch log groups need to be created externally to the module. The log group arn + enable_logs = false should then be passed into the module.

Full Changelog: 6.7.1...7.0.0