Improvments to typing messages (#5230)

config/config.json

@@ -38,7 +38,9 @@
         "RestrictCustomEmojiCreation": "all",
         "RestrictPostDelete": "all",
         "AllowEditPost": "always",
-        "PostEditTimeLimit": 300
+        "PostEditTimeLimit": 300,
+        "TimeBetweenUserTypingUpdatesMilliseconds": 5000,
+        "EnableUserTypingMessages": true
     },
     "TeamSettings": {
         "SiteName": "Mattermost",