fix: add owner field to conversation model (#893)

Author: atierian

packages/appsync-modelgen-plugin/src/__tests__/visitors/__snapshots__/appsync-model-introspection-visitor.test.ts.snap

@@ -98,6 +98,13 @@ exports[`Conversation Route Introspection Visitor Metadata snapshot should gener
                             \\"isArray\\": false,
                             \\"isRequired\\": false,
                             \\"isReadOnly\\": true
+                        },
+                        \\"owner\\": {
+                            \\"name\\": \\"owner\\",
+                            \\"type\\": \\"String\\",
+                            \\"attributes\\": [],
+                            \\"isArray\\": false,
+                            \\"isRequired\\": false
                         }
                     },
                     \\"syncable\\": true,

packages/appsync-modelgen-plugin/src/utils/process-conversation.ts

@@ -60,6 +60,7 @@ function generateConversationModel(modelName: string, messageModelName: string):
       messages: generateMessagesField(messageModelName),
       createdAt: generateTimestampField('createdAt'),
       updatedAt: generateTimestampField('updatedAt'),
+      owner: generateField('owner', 'String'),
     },
     syncable: true,
     pluralName: plural(modelName),