Support frontend plugin modules in CLI

Signed-off-by: solimant <solimant@users.noreply.github.com>

packages/cli/templates/frontend-plugin-module/.eslintrc.js.hbs

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+module.exports = require('@backstage/cli/config/eslint-factory')(__dirname);

packages/cli/templates/frontend-plugin-module/README.md.hbs

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+# {{packageName}}
+
+The {{moduleId}} frontend module for the {{pluginId}} plugin.
+
+_This plugin was created through the Backstage CLI_

packages/cli/templates/frontend-plugin-module/package.json.hbs

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+{
+  "name": "{{packageName}}",
+  "description": "The {{moduleId}} frontend module for the {{pluginId}} plugin.",
+  "main": "src/index.ts",
+  "types": "src/index.ts",
+  "publishConfig": {
+    "access": "public",
+    "main": "dist/index.cjs.js",
+    "module": "dist/index.esm.js",
+    "types": "dist/index.d.ts"
+  },
+  "backstage": {
+    "role": "frontend-plugin-module"
+  },
+  "sideEffects": false,
+  "scripts": {
+    "build": "backstage-cli package build",
+    "lint": "backstage-cli package lint",
+    "test": "backstage-cli package test",
+    "clean": "backstage-cli package clean",
+    "prepack": "backstage-cli package prepack",
+    "postpack": "backstage-cli package postpack"
+  },
+  "dependencies": {
+    "@backstage/frontend-plugin-api": "{{versionQuery '@backstage/frontend-plugin-api'}}"
+  },
+  "devDependencies": {
+    "@backstage/cli": "{{versionQuery '@backstage/cli'}}",
+    "@testing-library/jest-dom": "{{versionQuery '@testing-library/jest-dom' '6.0.0'}}"
+  },
+  "files": [
+    "dist"
+  ]
+}

packages/cli/templates/frontend-plugin-module/portable-template.yaml

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+name: frontend-plugin-module
+role: frontend-plugin-module
+description: A new frontend module that extends an existing frontend plugin
+values:
+  moduleVar: '{{ camelCase pluginId }}Module{{ upperFirst ( camelCase moduleId ) }}'

packages/cli/templates/frontend-plugin-module/src/index.ts.hbs

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+export { {{ moduleVar }} } from './plugin';

packages/cli/templates/frontend-plugin-module/src/plugin.ts.hbs

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+import { createFrontendModule } from '@backstage/frontend-plugin-api';
+
+export const {{ moduleVar }} = createFrontendModule({
+  pluginId: '{{ pluginId }}',
+  extensions: [
+    /* TODO */
+  ],
+});

packages/cli/templates/frontend-plugin-module/src/setupTests.ts

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+import '@testing-library/jest-dom';