[Feature] Website live chat (#187)

Co-authored-by: Nithin David Thomas <webofnithin@gmail.com>
Co-authored-by: Sojan Jose <sojan@pepalo.com>

app/views/api/v1/widget/messages/index.json.jbuilder

@@ -0,0 +1,9 @@
+json.array! @messages do |message|
+  json.id message.id
+  json.content message.content
+  json.message_type message.message_type_before_type_cast
+  json.created_at message.created_at.to_i
+  json.conversation_id message. conversation_id
+  json.attachment message.attachment.push_event_data if message.attachment
+  json.sender_name message.user.name if message.user
+end