[ECS] [request]: Allow setting log retention for awslog driver

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**Tell us about your request**
Currently, setting the log retention period via awslog driver isn't available, it would be great to have the ability to set this.

https://docs.aws.amazon.com/AmazonECS/latest/developerguide/using_awslogs.html#create_awslogs_logdriver_options

**Which service(s) is this request for?**
This could be Fargate, ECS

Start with the linked AWS awslogs documentation and identify the ECS and Fargate configuration entry points for log retention. Done means the requested retention setting is supported for the stated services and its behavior is verifiable.

Written by the indexing model from the issue text.