chore(java): use "software.amazon.awscdk.core" for core module (#3058)

use software.amazon.awscdk.core as the java package name for the core package, so it won't conflict with the old "cdk" package which used software.amazon.awscdk.core

misc: include sdk-api-metadata.json in @aws-cdk/custom-resources

packages/@aws-cdk/core/package.json

@@ -8,7 +8,7 @@
     "outdir": "dist",
     "targets": {
       "java": {
-        "package": "software.amazon.awscdk",
+        "package": "software.amazon.awscdk.core",
         "maven": {
           "groupId": "software.amazon.awscdk",
           "artifactId": "core"
@@ -88,4 +88,4 @@
     "node": ">= 8.10.0"
   },
   "stability": "experimental"
-}
+}

packages/@aws-cdk/custom-resources/.gitignore

@@ -13,4 +13,6 @@ lib/generated/resources.ts
 coverage
 .nycrc
 .LAST_PACKAGE
-*.snk
+*.snk
+
+lib/sdk-api-metadata.json

packages/@aws-cdk/custom-resources/.npmignore

@@ -17,4 +17,3 @@ dist
 
 *.tsbuildinfo
 
-lib/sdk-api-metadata.json

tools/pkglint/lib/rules.ts

@@ -485,13 +485,12 @@ function cdkModuleName(name: string) {
   const pythonName = name.replace(/^@/g, "").replace(/\//g, ".").split(".").map(caseUtils.kebab).join(".");
 
   return {
-    javaPackage: `software.amazon.awscdk${(isCdkPkg || isLegacyCdkPkg) ? '' : `.${name.replace(/^aws-/, 'services-').replace(/-/g, '.')}`}`,
+    javaPackage: `software.amazon.awscdk${isLegacyCdkPkg ? '' : `.${name.replace(/^aws-/, 'services-').replace(/-/g, '.')}`}`,
     mavenArtifactId:
-        isCdkPkg ? 'core'
-      : isLegacyCdkPkg ? 'cdk'
-      : name.startsWith('aws-') || name.startsWith('alexa-')
-          ? name.replace(/^aws-/, '')
-          : `cdk-${name}`,
+      isLegacyCdkPkg ? 'cdk'
+        : isCdkPkg ? 'core'
+          : name.startsWith('aws-') || name.startsWith('alexa-') ? name.replace(/^aws-/, '')
+            : `cdk-${name}`,
     dotnetNamespace: `Amazon.CDK${isCdkPkg ? '' : `.${dotnetSuffix}`}`,
     python: {
       distName: `aws-cdk.${pythonName}`,