fix(eks): failures when creating or updating clusters

There were two causes of timeouts for EKS cluster creation: create time which is longer than the AWS Lambda timeout (15min) and lack of retry when applying kubectl after the cluster has been created.

The change fixes the first issue by leveraging the custom resource provider framework to implement the cluster resource as an async resource. The custom resource providers are now bundled as nested stacks so they don't take up too many resources from users, and are also reused by multiple clusters within the same stack. This required that the creation role will not be the same as the lambda role, so we define this role separately and assume it within the providers.

The second issue is fixed by adding 3 retries to "kubectl apply".

**Backwards compatibility**: as described in #5544, since the resource provider handler of `Cluster` and `KubernetesResource` has been changed, this change requires a replacement of existing clusters (deployment fails with "service token cannot be changed" error). Since this can be disruptive to users, this change includes an exact copy of the previous version under a new module called `@aws-cdk/aws-eks-legacy`, which can be used as a drop-in replacement until users decide to upgrade to the new version. Using the legacy cluster will emit a synthesis warning that this module will no longer be released as part of the CDK starting March 1st, 2020.

- Fixes #4087
- Fixes #4695
- Fixes #5259
- Fixes #5501

---

BREAKING CHANGE: (in experimental module) the providers behind the AWS EKS module have been rewritten to address multiple stability issues. Since this change requires cluster replacement, the old version of this module is available under `@aws-cdk/aws-eks-legacy`. Please read #5544 carefully for upgrade instructions.

packages/@aws-cdk/aws-eks-legacy/.gitignore

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+*.js
+*.js.map
+*.d.ts
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+tslint.json
+node_modules
+*.generated.ts
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packages/@aws-cdk/aws-eks-legacy/.npmignore

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