notif: Make directory, and move out of "utils".

A name like "util" or "utils" or "lib" is pretty unhelpful in general,
carrying nearly no meaning.

Making a directory will help us organize other notifications-related
code.

Author: gnprice

src/boot/AppEventHandlers.js

@@ -14,7 +14,7 @@ import type {
   UserIdMap,
 } from '../types';
 import { getSession, getUnreadByHuddlesMentionsAndPMs, getUsersById } from '../selectors';
-import { handleInitialNotification, NotificationListener } from '../utils/notifications';
+import { handleInitialNotification, NotificationListener } from '../notification';
 import {
   appOnline,
   appOrientation,

src/nav/navReducers.js

@@ -11,7 +11,7 @@ import type {
 import config from '../config';
 import { navigateToChat } from './navActions';
 import { getUsersById } from '../users/userSelectors';
-import { getNarrowFromNotificationData } from '../utils/notifications';
+import { getNarrowFromNotificationData } from '../notification';
 import AppNavigator from './AppNavigator';
 import { NULL_NAV_STATE } from '../nullObjects';
 import {

src/utils/__tests__/notifications-test.js src/notification/__tests__/notification-test.js

@@ -1,5 +1,5 @@
-import { getNarrowFromNotificationData, handleNotificationMuddle } from '../notifications';
-import { HOME_NARROW, topicNarrow, privateNarrow, groupNarrow } from '../narrow';
+import { getNarrowFromNotificationData, handleNotificationMuddle } from '..';
+import { HOME_NARROW, topicNarrow, privateNarrow, groupNarrow } from '../../utils/narrow';
 
 describe('getNarrowFromNotificationData', () => {
   test('unknown notification data returns home narrow', () => {

src/utils/notifications.js src/notification/index.js

@@ -6,7 +6,7 @@ import type { Auth, Dispatch, Notification, NotificationGroup, UserIdMap } from
 import { HOME_NARROW, topicNarrow, privateNarrow, groupNarrow } from '../utils/narrow';
 import config from '../config';
 import { registerPush, unregisterPush } from '../api';
-import { logErrorRemotely } from './logging';
+import { logErrorRemotely } from '../utils/logging';
 import { doNarrow } from '../message/messagesActions';
 
 const getGroupNarrowFromNotificationData = (data: NotificationGroup, usersById: UserIdMap = {}) => {

src/realm/realmActions.js

@@ -15,7 +15,7 @@ import type {
 import {
   getNotificationToken,
   tryStopNotifications as innerStopNotifications,
-} from '../utils/notifications';
+} from '../notification';
 import { getAuth, getPushToken } from '../selectors';
 import { getRealmEmojis, getRealmFilters } from '../api';
 import {