Add attachments (#733)

* Add attachments v1

* Refacto

* Add Policy checks

* Fix tests

* Remove generated files from git

---------

Co-authored-by: Charles Bochet <charles@twenty.com>

front/src/modules/activities/queries/update.ts

@@ -91,3 +91,9 @@ export const UPDATE_COMMENT_THREAD = gql`
     }
   }
 `;
+
+export const UPLOAD_ATTACHMENT = gql`
+  mutation UploadAttachment($file: Upload!, $activityId: String!) {
+    uploadAttachment(file: $file, activityId: $activityId)
+  }
+`;