refactor(core): rename @aws-cdk/cdk to @aws-cdk/core (#2932)

Rename the module @aws-cdk/cdk to @aws-cdk/core since this is a more suitable name for it. 

Language-specific names:
- Python: aws_cdk.core (renamed)
- .NET: Amazon.CDK (not renamed)
- Java: only artifactId changed to `core` but package and groupId are still `software.amazon.awscdk`

This change completely deletes the @aws-cdk/cdk module from the repo as a temporary measure, to ensure there are no lingering references. A subsequent commit will introduce @aws-cdk/cdk as a deprecated package.

Fixed #2733 

BREAKING CHANGE: The `@aws-cdk/cdk` module was renamed to @aws-cdk/core
* **Python:** The `aws_cdk.cdk` module was renamed to `aws_cdk.core`
* **Java:** The artifact `cdk` in groupId `software.amazon.awscdk` was renamed to `core`

Author: Elad Ben-Israel

packages/@aws-cdk/alexa-ask/package.json

@@ -70,10 +70,10 @@
     "pkglint": "^0.35.0"
   },
   "dependencies": {
-    "@aws-cdk/cdk": "^0.35.0"
+    "@aws-cdk/core": "^0.35.0"
   },
   "peerDependencies": {
-    "@aws-cdk/cdk": "^0.35.0"
+    "@aws-cdk/core": "^0.35.0"
   },
   "engines": {
     "node": ">= 8.10.0"

packages/@aws-cdk/app-delivery/README.md

@@ -2,7 +2,7 @@ import cfn = require('@aws-cdk/aws-cloudformation');
 import codepipeline = require('@aws-cdk/aws-codepipeline');
 import cpactions = require('@aws-cdk/aws-codepipeline-actions');
 import iam = require('@aws-cdk/aws-iam');
-import cdk = require('@aws-cdk/cdk');
+import cdk = require('@aws-cdk/core');
 import cxapi = require('@aws-cdk/cx-api');
 
 export interface PipelineDeployStackActionProps {

packages/@aws-cdk/app-delivery/lib/pipeline-deploy-stack-action.ts

@@ -43,7 +43,7 @@
     "@aws-cdk/aws-codepipeline": "^0.35.0",
     "@aws-cdk/aws-codepipeline-actions": "^0.35.0",
     "@aws-cdk/aws-iam": "^0.35.0",
-    "@aws-cdk/cdk": "^0.35.0",
+    "@aws-cdk/core": "^0.35.0",
     "@aws-cdk/cx-api": "^0.35.0"
   },
   "devDependencies": {
@@ -76,7 +76,7 @@
     "@aws-cdk/aws-codepipeline": "^0.35.0",
     "@aws-cdk/aws-codepipeline-actions": "^0.35.0",
     "@aws-cdk/aws-iam": "^0.35.0",
-    "@aws-cdk/cdk": "^0.35.0",
+    "@aws-cdk/core": "^0.35.0",
     "@aws-cdk/cx-api": "^0.35.0"
   },
   "engines": {

packages/@aws-cdk/app-delivery/package.json

@@ -2,7 +2,7 @@ import cfn = require('@aws-cdk/aws-cloudformation');
 import codepipeline = require('@aws-cdk/aws-codepipeline');
 import cpactions = require('@aws-cdk/aws-codepipeline-actions');
 import s3 = require('@aws-cdk/aws-s3');
-import cdk = require('@aws-cdk/cdk');
+import cdk = require('@aws-cdk/core');
 import cicd = require('../lib');
 
 const app = new cdk.App();

packages/@aws-cdk/app-delivery/test/integ.cicd.ts

@@ -5,8 +5,8 @@ import codepipeline = require('@aws-cdk/aws-codepipeline');
 import cpactions = require('@aws-cdk/aws-codepipeline-actions');
 import iam = require('@aws-cdk/aws-iam');
 import s3 = require('@aws-cdk/aws-s3');
-import cdk = require('@aws-cdk/cdk');
-import { ConstructNode } from '@aws-cdk/cdk';
+import cdk = require('@aws-cdk/core');
+import { ConstructNode } from '@aws-cdk/core';
 import cxapi = require('@aws-cdk/cx-api');
 import fc = require('fast-check');
 import nodeunit = require('nodeunit');

packages/@aws-cdk/app-delivery/test/test.pipeline-deploy-stack-action.ts

@@ -1,4 +1,4 @@
-import { Stack } from "@aws-cdk/cdk";
+import { Stack } from "@aws-cdk/core";
 import cxapi = require("@aws-cdk/cx-api");
 import { HaveResourceAssertion, ResourcePart } from "./lib/assertions/have-resource";
 import { MatchStyle, matchTemplate } from "./lib/assertions/match-template";

packages/@aws-cdk/assert/jest.ts

@@ -1,4 +1,4 @@
-import cdk = require('@aws-cdk/cdk');
+import cdk = require('@aws-cdk/core');
 import api = require('@aws-cdk/cx-api');
 import { StackInspector } from './inspector';
 import { SynthUtils } from './synth-utils';

packages/@aws-cdk/assert/lib/expect.ts

@@ -1,4 +1,4 @@
-import { ConstructNode, Stack, SynthesisOptions } from '@aws-cdk/cdk';
+import { ConstructNode, Stack, SynthesisOptions } from '@aws-cdk/core';
 import cxapi = require('@aws-cdk/cx-api');
 
 export class SynthUtils {

packages/@aws-cdk/assert/lib/synth-utils.ts

@@ -31,7 +31,7 @@
     "pkglint": "^0.35.0"
   },
   "dependencies": {
-    "@aws-cdk/cdk": "^0.35.0",
+    "@aws-cdk/core": "^0.35.0",
     "@aws-cdk/cloudformation-diff": "^0.35.0",
     "@aws-cdk/cx-api": "^0.35.0",
     "jest": "^24.8.0",