Add /dev endpoint

Signed-off-by: sriram ramakrishnan <sramakr@gmail.com>

plugins/analytics-module-ga4/dev/Playground.tsx

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2021 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import React from 'react';
+import { Link } from '@backstage/core-components';
+
+export const Playground = () => {
+  return (
+    <>
+      <Link to="#clicked">Click Here</Link>
+    </>
+  );
+};

plugins/analytics-module-ga4/dev/index.tsx

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+/*
+ * Copyright 2021 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import React from 'react';
+import { createDevApp } from '@backstage/dev-utils';
+import { Playground } from './Playground';
+
+import { createPlugin } from '@backstage/core-plugin-api';
+
+/**
+ * @deprecated Importing and including this plugin in an app has no effect.
+ * This will be removed in a future release.
+ *
+ * @public
+ */
+export const analyticsModuleGA4 = createPlugin({
+  id: 'analytics-provider-ga4',
+});
+createDevApp()
+  .registerPlugin(analyticsModuleGA4)
+  .addPage({
+    path: '/ga4',
+    title: 'GA4 Playground',
+    element: <Playground />,
+  })
+  .render();