Basic discussions forum framework

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

src/discussions/comments/data/thunks.js

@@ -0,0 +1,17 @@
+/* eslint-disable import/prefer-default-export */
+import { logError } from '@edx/frontend-platform/logging';
+import { getThreadComments } from './api';
+import { fetchCommentsFailed, fetchCommentsRequest, fetchCommentsSuccess } from './slices';
+
+export function fetchTopicComments(topicId) {
+  return async (dispatch) => {
+    try {
+      dispatch(fetchCommentsRequest({ topicId }));
+      const data = await getThreadComments(topicId);
+      dispatch(fetchCommentsSuccess({ topicId, data }));
+    } catch (error) {
+      dispatch(fetchCommentsFailed());
+      logError(error);
+    }
+  };
+}