add native item with package ID to package.json

in order to make the `android/build.gradle` artifact 100% generic

i.e. rendered directly from the template,
with zero module-specific customization

Author: Christopher J. Brody

templates/android.js

@@ -1,6 +1,6 @@
 module.exports = platform => [{
   name: () => `${platform}/build.gradle`,
-  content: ({ packageIdentifier }) => `// ${platform}/build.gradle
+  content: () => `// ${platform}/build.gradle
 
 // based on:
 //
@@ -84,7 +84,7 @@ def configureReactNativePom(def pom) {
         name packageJson.title
         artifactId packageJson.name
         version = packageJson.version
-        group = "${packageIdentifier}"
+        group = packageJson.native.packageIdentifier
         description packageJson.description
         url packageJson.repository.baseUrl
 

templates/general.js

@@ -21,7 +21,7 @@ ${name};
 `,
 }, {
   name: () => 'package.json',
-  content: ({ moduleName, platforms, githubAccount, authorName, authorEmail, license }) => {
+  content: ({ moduleName, packageIdentifier, platforms, githubAccount, authorName, authorEmail, license }) => {
     const peerDependencies =
       `{
     "react": "^16.8.1",
@@ -58,6 +58,9 @@ ${name};
   "license": "${license}",
   "licenseFilename": "LICENSE",
   "readmeFilename": "README.md",
+  "native": {
+    "packageIdentifier": "${packageIdentifier}"
+  },
   "peerDependencies": ${peerDependencies},
   "devDependencies": ${devDependencies}
 }