feat(ek8s): Integration package for EKS and CDK8s

packages/@aws-cdk/aws-ek8s/.eslintrc.js

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+const baseConfig = require('cdk-build-tools/config/eslintrc');
+baseConfig.parserOptions.project = __dirname + '/tsconfig.json';
+module.exports = baseConfig;

packages/@aws-cdk/aws-ek8s/.gitignore

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+*.js
+*.js.map
+*.d.ts
+tsconfig.json
+node_modules
+*.generated.ts
+dist
+.jsii
+
+.LAST_BUILD
+.nyc_output
+coverage
+nyc.config.js
+.LAST_PACKAGE
+*.snk
+!.eslintrc.js
+!jest.config.js
+
+junit.xml

packages/@aws-cdk/aws-ek8s/.npmignore

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+# Don't include original .ts files when doing `npm pack`
+*.ts
+!*.d.ts
+coverage
+.nyc_output
+*.tgz
+
+dist
+.LAST_PACKAGE
+.LAST_BUILD
+!*.js
+
+# Include .jsii
+!.jsii
+
+*.snk
+
+*.tsbuildinfo
+
+tsconfig.json
+.eslintrc.js
+jest.config.js
+
+# exclude cdk artifacts
+**/cdk.out
+junit.xml
+test/

packages/@aws-cdk/aws-ek8s/LICENSE

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packages/@aws-cdk/aws-ek8s/NOTICE

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+AWS Cloud Development Kit (AWS CDK)
+Copyright 2018-2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.

packages/@aws-cdk/aws-ek8s/README.md

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+## AWS EK8s
+<!--BEGIN STABILITY BANNER-->
+---
+
+![cdk-constructs: Experimental](https://img.shields.io/badge/cdk--constructs-experimental-important.svg?style=for-the-badge)
+
+> The APIs of higher level constructs in this module are experimental and under active development. They are subject to non-backward compatible changes or removal in any future version. These are not subject to the [Semantic Versioning](https://semver.org/) model and breaking changes will be announced in the release notes. This means that while you may use them, you may need to update your source code when upgrading to a newer version of this package.
+
+---
+<!--END STABILITY BANNER-->
+
+This package provides `cdk8s` integration with the [EKS](../aws-eks/README.md) construct library,
+allowing you to apply cdk8s charts on Amazon EKS clusters.
+
+[CDK8s](https://cdk8s.io/) is an open-source library that enables Kubernetes manifest authoring using familiar programming languages. It is founded on the same technologies as the AWS CDK, such as [`constructs`](https://github.com/aws/constructs) and [`jsii`](https://github.com/aws/jsii).
+
+> To learn more about cdk8s, visit the [Getting Started](https://github.com/awslabs/cdk8s/tree/master/docs/getting-started) tutorials.
+
+In addition to `cdk8s`, you can also use [`cdk8s+`](https://github.com/awslabs/cdk8s/tree/master/packages/cdk8s-plus), which provides higher level abstraction for the core kubernetes api objects.
+You can think of it like the `L2` constructs for Kubernetes. Any other `cdk8s` based libraries are also supported, for example [`cdk8s-debore`](https://github.com/toricls/cdk8s-debore).
+
+To get started, add the following dependencies to your `package.json` file:
+
+```json
+"dependencies": {
+  "@aws-cdk/aws-ek8s": "^1.69.0",
+  "cdk8s": "0.30.0",
+  "cdk8s-plus": "0.30.0",
+  "constructs": "3.0.4"
+}
+```
+
+> Note that the version of `cdk8s` must be `>=0.30.0`.
+
+Similarly to how you would create a stack by extending `@aws-cdk/core.Stack`, we recommend you create a chart of your own that extends `cdk8s.Chart`,
+and add your kubernetes resources to it. You can use `aws-cdk` construct attributes and properties inside your `cdk8s` construct freely.
+
+In this example we create a chart that accepts an `s3.Bucket` and passes its name to a kubernetes pod as an environment variable.
+
+Notice that the chart must accept a `constructs.Construct` type as its scope, not an `@aws-cdk/core.Construct` as you would normally use.
+For this reason, to avoid possible confusion, we will create the chart in a separate file:
+
+`+ my-chart.ts`
+```ts
+import * as s3 from '@aws-cdk/aws-s3';
+import * as constructs from 'constructs';
+import * as cdk8s from 'cdk8s';
+import * as kplus from 'cdk8s-plus';
+
+export interface MyChartProps {
+  readonly bucket: s3.Bucket;
+}
+
+export class MyChart extends cdk8s.Chart {
+  constructor(scope: constructs.Construct, id: string, props: MyChartProps) {
+    super(scope, id);
+
+    new kplus.Pod(this, 'Pod', {
+      spec: {
+        containers: [
+          new kplus.Container({
+            image: 'my-image',
+            env: {
+              BUCKET_NAME: kplus.EnvValue.fromValue(props.bucket.bucketName),
+            },
+          }),
+        ],
+      },
+    });
+  }
+}
+```
+
+Then, in your AWS CDK app:
+
+```ts
+import * as s3 from '@aws-cdk/aws-s3';
+import * as ek8s from '@aws-cdk/aws-ek8s';
+import * as cdk8s from 'cdk8s';
+import { MyChart } from './my-chart';
+
+// some bucket..
+const bucket = new s3.Bucket(this, 'Bucket');
+
+// create a cdk8s chart and use `cdk8s.App` as the scope.
+const myChart = new MyChart(new cdk8s.App(), 'MyChart', { bucket });
+
+// add the cdk8s chart as a custom chart to the cluster
+cluster.addCustomChart('my-chart', new ek8s.Cdk8sChart(myChart));
+```
+
+## Custom CDK8s Constructs
+
+You can also compose a few stock `cdk8s+` constructs into your own custom construct. However, since mixing scopes between `aws-cdk` and `cdk8s` is currently not supported, the `Construct` class
+you'll need to use is the one from the [`constructs`](https://github.com/aws/constructs) module, and not from `@aws-cdk/core` like you normally would.
+This is why we used `new cdk8s.App()` as the scope of the chart above.
+
+```ts
+import * as constructs from 'constructs';
+import * as cdk8s from 'cdk8s';
+import * as kplus from 'cdk8s-plus';
+
+export interface LoadBalancedWebService {
+  readonly port: number;
+  readonly image: string;
+  readonly replicas: number;
+}
+
+export class LoadBalancedWebService extends constructs.Construct {
+  constructor(scope: constructs.Construct, id: string, props: LoadBalancedWebService) {
+    super(scope, id);
+
+    const deployment = new kplus.Deployment(chart, 'Deployment', {
+      spec: {
+        replicas: props.replicas,
+        podSpecTemplate: {
+          containers: [ new kplus.Container({ image: props.image }) ]
+        }
+      },
+    });
+
+    deployment.expose({port: props.port, serviceType: kplus.ServiceType.LOAD_BALANCER})
+
+  }
+}
+```

packages/@aws-cdk/aws-ek8s/jest.config.js

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+const baseConfig = require('cdk-build-tools/config/jest.config');
+module.exports = baseConfig;