[ECS] [request]: Allow ECS events logs to be published to CloudWatch log group

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**Tell us about your request**
What do you want us to build?
ECS should allow the ECS events logs visible on console to also be published to a Cloudwatch log group via a setting on the console and CloudFormation for ECS service. This would then allow us to setup rules and alerts on the log group

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

**Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?**
Its hard to keep track of the ECS events via the console since they are not retained forever and there is no retention setting to control the same

**Are you currently working around this issue?**
How are you currently solving this problem?
A custom Lambda written to listen for ECS stop/exit events and push custom messages depicting this to cloudwatch which then has alarms setup on it for those custom messages

**Additional context**
Anything else we should know?

**Attachments**
If you think you might have additional information that you'd like to include via an attachment, please do - we'll take a look. (Remember to remove any personally-identifiable information.)

No files, tests, or entry points are mentioned; start by clarifying how ECS events would be delivered to CloudWatch Logs and how the ECS service's CloudFormation and console settings should represent that configuration. Done means ECS events are retained in a configurable CloudWatch log group and the requested console and CloudFormation controls are defined.

Written by the indexing model from the issue text.