test: building two independent test apps

This adds an "example-plugin-app" and also gives "example" its own package.json and build files.  It separates out the test apps from the library in their parent directory, making them more independent.

example-plugin-app/.env.development

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+EXAMPLE_VAR=Example Value
+ACCESS_TOKEN_COOKIE_NAME=edx-jwt-cookie-header-payload
+BASE_URL=http://localhost:8081
+CREDENTIALS_BASE_URL=http://localhost:18150
+CSRF_TOKEN_API_PATH=/csrf/api/v1/token
+DISCOVERY_API_BASE_URL=http://localhost:18381
+PUBLISHER_BASE_URL=http://localhost:18400
+ECOMMERCE_BASE_URL=http://localhost:18130
+LANGUAGE_PREFERENCE_COOKIE_NAME=openedx-language-preference
+LMS_BASE_URL=http://localhost:18000
+LOGIN_URL=http://localhost:18000/login
+LOGOUT_URL=http://localhost:18000/logout
+STUDIO_BASE_URL=http://localhost:18010
+MARKETING_SITE_BASE_URL=http://localhost:18000
+ORDER_HISTORY_URL=http://localhost:1996/orders
+REFRESH_ACCESS_TOKEN_ENDPOINT=http://localhost:18000/login_refresh
+SEGMENT_KEY=''
+SITE_NAME=localhost
+USER_INFO_COOKIE_NAME=edx-user-info
+LOGO_URL=https://edx-cdn.org/v3/default/logo.svg
+LOGO_TRADEMARK_URL=https://edx-cdn.org/v3/default/logo-trademark.svg
+LOGO_WHITE_URL=https://edx-cdn.org/v3/default/logo-white.svg
+FAVICON_URL=https://edx-cdn.org/v3/default/favicon.ico
+IGNORED_ERROR_REGEX=
+PORT=8081

example-plugin-app/.env.test

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+EXAMPLE_VAR=Example Value
+ACCESS_TOKEN_COOKIE_NAME=edx-jwt-cookie-header-payload
+BASE_URL=http://localhost:8081
+CREDENTIALS_BASE_URL=http://localhost:18150
+CSRF_TOKEN_API_PATH=/csrf/api/v1/token
+DISCOVERY_API_BASE_URL=http://localhost:18381
+PUBLISHER_BASE_URL=http://localhost:18400
+ECOMMERCE_BASE_URL=http://localhost:18130
+LANGUAGE_PREFERENCE_COOKIE_NAME=openedx-language-preference
+LMS_BASE_URL=http://localhost:18000
+LOGIN_URL=http://localhost:18000/login
+LOGOUT_URL=http://localhost:18000/logout
+STUDIO_BASE_URL=http://localhost:18010
+MARKETING_SITE_BASE_URL=http://localhost:18000
+ORDER_HISTORY_URL=http://localhost:1996/orders
+REFRESH_ACCESS_TOKEN_ENDPOINT=http://localhost:18000/login_refresh
+SEGMENT_KEY=''
+SITE_NAME=localhost
+USER_INFO_COOKIE_NAME=edx-user-info
+LOGO_URL=https://edx-cdn.org/v3/default/logo.svg
+LOGO_TRADEMARK_URL=https://edx-cdn.org/v3/default/logo-trademark.svg
+LOGO_WHITE_URL=https://edx-cdn.org/v3/default/logo-white.svg
+FAVICON_URL=https://edx-cdn.org/v3/default/favicon.ico
+IGNORED_ERROR_REGEX=

example-plugin-app/.eslintignore

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+.idea
+coverage
+dist
+docs
+node_modules
+src/analytics/segment.js

example-plugin-app/.eslintrc.js

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+const { getBaseConfig } = require('@edx/frontend-build');
+
+const config = getBaseConfig('eslint');
+
+config.rules = {
+  'import/no-extraneous-dependencies': ['error', {
+    'devDependencies': [
+      '**/*.config.js',
+      '**/*.test.jsx',
+      '**/*.test.js',
+      'example/*',
+    ],
+  }],
+  'import/extensions': ['error', {
+    ignore: ['@edx/frontend-platform*'],
+  }],
+  'import/no-unresolved': ['error', {
+    ignore: ['@edx/frontend-platform*'],
+  }],
+  'jsx-a11y/anchor-is-valid': ['error', {
+    components: ['Link'],
+    specialLink: [],
+    specialLink: ['to'],
+    aspects: ['noHref', 'invalidHref', 'preferButton'],
+  }],
+  'react/react-in-jsx-scope': ['error'],
+};
+
+module.exports = config;