Chore: Message to support multiple attachments (#730)

* Changes for the message to have multiple attachments
* changed the message association to attachments from has_one to has_many
* changed all the references of this association in building and fetching to reflect this change

* Added number of attachments validation to the message model

* Modified the backend responses and endpoints to reflect multiple attachment support (#737)

* Changing the frontend components for multiple attachments
* changed the request structure to reflect the multiple attachment structures
* changed the message bubbles to support multiple attachments
* bugfix: agent side attachment was not showing because of a missing await
* broken message was shown because of the store filtering
* Added documentation for ImageMagick

* spec fixes

* refactored code to reflect more apt namings

* Added updated message listener for the dashboard (#727)
* Added the publishing for message updated event
* Implemented the listener for dashboard

Co-authored-by: Pranav Raj Sreepuram <pranavrajs@gmail.com>

app/javascript/dashboard/store/modules/conversations/actions.js

@@ -145,6 +145,10 @@ const actions = {
     commit(types.default.ADD_MESSAGE, message);
   },
 
+  updateMessage({ commit }, message) {
+    commit(types.default.ADD_MESSAGE, message);
+  },
+
   addConversation({ commit }, conversation) {
     commit(types.default.ADD_CONVERSATION, conversation);
   },
@@ -192,7 +196,7 @@ const actions = {
 
   sendAttachment: async ({ commit }, data) => {
     try {
-      const response = MessageApi.sendAttachment(data);
+      const response = await MessageApi.sendAttachment(data);
       commit(types.default.SEND_MESSAGE, response.data);
     } catch (error) {
       // Handle error