Add trends UI with admin and user settings (#11502)

app/javascript/mastodon/actions/trends.js

@@ -0,0 +1,32 @@
+import api from '../api';
+
+export const TRENDS_FETCH_REQUEST = 'TRENDS_FETCH_REQUEST';
+export const TRENDS_FETCH_SUCCESS = 'TRENDS_FETCH_SUCCESS';
+export const TRENDS_FETCH_FAIL    = 'TRENDS_FETCH_FAIL';
+
+export const fetchTrends = () => (dispatch, getState) => {
+  dispatch(fetchTrendsRequest());
+
+  api(getState)
+    .get('/api/v1/trends')
+    .then(({ data }) => dispatch(fetchTrendsSuccess(data)))
+    .catch(err => dispatch(fetchTrendsFail(err)));
+};
+
+export const fetchTrendsRequest = () => ({
+  type: TRENDS_FETCH_REQUEST,
+  skipLoading: true,
+});
+
+export const fetchTrendsSuccess = trends => ({
+  type: TRENDS_FETCH_SUCCESS,
+  trends,
+  skipLoading: true,
+});
+
+export const fetchTrendsFail = error => ({
+  type: TRENDS_FETCH_FAIL,
+  error,
+  skipLoading: true,
+  skipAlert: true,
+});