Basic discussions forum framework

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

src/discussions/comments/data/api.js

@@ -0,0 +1,31 @@
+/* eslint-disable import/prefer-default-export */
+import { getAuthenticatedHttpClient } from '@edx/frontend-platform/auth';
+import { API_BASE_URL } from '../../../data/constants';
+
+export async function getThreadComments(
+  threadId, {
+    commentId, page, pageSize, requestedFields,
+  } = {},
+) {
+  const url = new URL(`${API_BASE_URL}/api/discussion/v1/comments/`);
+  const paramsMap = {
+    thread_id: threadId,
+    comment_id: commentId,
+    page,
+    page_size: pageSize,
+    requested_fields: requestedFields,
+  };
+  Object.keys(paramsMap)
+    .forEach(
+      (param) => {
+        const paramValue = paramsMap[param];
+        if (paramValue) {
+          url.searchParams.append(param, paramValue);
+        }
+      },
+    );
+
+  const { data } = await getAuthenticatedHttpClient()
+    .get(url);
+  return data;
+}