feat(aws-ecs-builder): RFC 219 - An extendable service class for AWS ECS

[nathanpeck]

This PR implements RFC 219

It adds a new module called "@aws-containers/aws-ecs-builder" (Name proposed but not final) with following new constructs:

• Environment - A deploy environment for a service which by default supplies its own VPC, and ECS cluster with Fargate capacity
• Service - An ECS service

And supporting classes:

• ServiceDescription - Defines the application to run as a service, and any features it needs
• ServiceExtension - Defines an optional extension that may be added to a service to enhance it with new capabilities or connect it to other ECS adjacent features

This PR comes with a ServiceExtension for each of the following ECS adjacent features:

• AppMesh
• X-Ray
• CloudWatch Agent
• Application Load Balancer
• FireLens

Developers can use this new extendable Service class to build a ServiceDescription that defines their application and as many optional service extensions as they want. The ServiceDescription is used to build out a Service inside an Environment

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

[bcelenza]

Initial comments from an App Mesh / general application networking perspective.

Generally, love the approach and excited to build on this concept further!

[bcelenza]

Is there an assumption that every service has a listener? For example, services which read from message queues often don't.

[SoManyHs]

Mostly copy-edit nits, and some naming discrepencies. Did not get through all of it but wanted to publish this before we talked!

[SoManyHs]

I tried to proactively put in suggestions for things like punctuation at the end of docstrings: see #9069 (comment)

[skinny85]

Some minor comments.

[skinny85]

I believe this info belongs in the region-info package. At least in the appmesh package - I don't think this is the greatest place for it.

[nathanpeck]

We have some work on the underlying L2 appmesh package scheduled. I'll discuss with the team when that second pass begins. I agree this is something we should probably implement as part of that pass to catch the L2's up to the current CFN features.

[bcelenza]

Agree, region-info package can own this configuration and we can tackle it as part of L2 work (either myself or @dfezzie). We're considering an SSM parameter for this longer term (aws/aws-app-mesh-roadmap#257).

Pull request has been modified.

[aws-cdk-automation]

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