Basic discussions forum framework

Adds the basic structure for the Discussions MFE around which future development
will happen.

src/discussions/topics/data/api.js

@@ -0,0 +1,13 @@
+/* eslint-disable import/prefer-default-export */
+import { getAuthenticatedHttpClient } from '@edx/frontend-platform/auth';
+import { API_BASE_URL } from '../../../data/constants';
+
+export async function getCourseTopics(courseId, topicIds) {
+  const url = new URL(`${API_BASE_URL}/api/discussion/v1/course_topics/${courseId}`);
+  if (topicIds) {
+    url.searchParams.append('topic_id', topicIds.join(','));
+  }
+  const { data } = await getAuthenticatedHttpClient()
+    .get(url);
+  return data;
+}