fix(aws-ecs): refactor high level aws-ecs constructs into the aws-ecs-patterns module

[piradeepk]

Refactored all high level constructs from the aws-ecs module into the aws-ecs-patterns module as discussed offline.

BREAKING CHANGE: These changes move all L3 and higher constructs out of the aws-ecs module into the aws-ecs-patterns module. The following constructs have been moved into the aws-ecs-patterns module: EcsQueueWorkerService, FargateQueueWorkerService, LoadBalancedEcsService, LoadBalancedFargateService and LoadBalancedFargateServiceApplets.

Pull Request Checklist

• Testing
  • Unit test added (prefer not to modify an existing test, otherwise, it's probably a breaking change)
  • CLI change?: coordinate update of integration tests with team
  • cdk-init template change?: coordinated update of integration tests with team
• Docs
  • jsdocs: All public APIs documented
  • README: README and/or documentation topic updated
  • Design: For significant features, design document added to design folder
• Title and Description
  • Change type: title prefixed with fix, feat and module name in parens, which will appear in changelog
  • Title: use lower-case and doesn't end with a period
  • Breaking?: last paragraph: "BREAKING CHANGE: <describe what changed + link for details>"
  • Issues: Indicate issues fixed via: "Fixes #xxx" or "Closes #xxx"
• Sensitive Modules (requires 2 PR approvers)
  • IAM Policy Document (in @aws-cdk/aws-iam)
  • EC2 Security Groups and ACLs (in @aws-cdk/aws-ec2)
  • Grant APIs (only if not based on official documentation with a reference)

---

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license.

[Doug-AWS]

@awslabs/aws-cdk-team Are we going to follow this model? Do we want to come up with what we call these? CDK Pattern Resources?

[rix0rrr]

I would call this a fix and it needs a BREAKING CHANGE notice for the classes you moved.

[piradeepk]

I would call this a fix and it needs a BREAKING CHANGE notice for the classes you moved.

Updated the title to be fix, and added a BREAKING CHANGE notice.