chore: API documentation updates for CSAT surveys (#7255)

- Expose conversation uuid in APIs
- swagger documentation for cast survey update via public/message/update endpoints
- swagger documentation for survey/responses/conversation_uuid endpoint

Fixes: #6328

swagger/paths/survey/show.yml

@@ -0,0 +1,9 @@
+tags:
+  - CSAT Survey Page
+operationId: get-csat-survey-page
+summary: Get CSAT survey page
+description: You can redirect the client to this URL, instead of implementing the CSAT survey component yourself.
+security: []
+responses:
+  200:
+    description: Success