47 end user typed text seen by csa while typed (buerokratt#169)

* feat buerokratt#47 add lodash to project

* feat buerokratt#47 add message preview SSE mock data

* feat buerokratt#47 add preview message css

* feat buerokratt#47 add SSE event message-preview enum

* feat buerokratt#47 add SSE event message-preview response type

* feat buerokratt#47 add check mocked chat message preview

* feat buerokratt#47 add message-preview SSE response

Author: sergeirudz

docs/sse-events.md

@@ -155,6 +155,28 @@ Response body for SSE: `cs-get-new-messages`
   "updated": "2023-01-24T08:42:01.545+00:00",
 }
 ```
+## End user message preview is sent
+Response body for SSE: `cs-get-new-messages`
+```json
+    {
+        "id": "944648e5-9816-4bca-b600-a2db5d977758",
+        "chatid": "50356c0c-b0ec-45cc-9601-fac90307b792",
+        "content": "",
+        "event": "message-preview",
+        "authorId": "",
+        "authorTimestamp": '2023-01-23T15:13:42.830+00:00',
+        "authorFirstName": "",
+        "authorLastName": "",
+        "authorRole": "end-user",
+        "forwardedByUser": "",
+        "forwardedFromCsa": "",
+        "forwardedToCsa": "",
+        "preview": "Mul on vaja abi",
+        "rating": "",
+        "created": '2023-01-23T15:13:42.830+00:00',
+        "updated": '2023-01-23T15:13:42.837+00:00',
+    }
+```
 
 ## Chat activities