fix(task): restore task metadata contract and type fields in task types api

backend/docs/swagger.yaml

@@ -49,6 +49,8 @@ definitions:
     type: object
   contracts.TaskMetaDTO:
     properties:
+      asynq_task:
+        type: string
       category:
         type: string
       description:
@@ -65,18 +67,28 @@ definitions:
         type: array
       queue:
         type: string
+      retryable:
+        type: boolean
       schedule:
         type: string
+      supports_time:
+        type: boolean
       timeout:
         $ref: '#/definitions/time.Duration'
+      type:
+        type: string
     type: object
   contracts.TaskParamDTO:
     properties:
       default: {}
       description:
         type: string
+      label:
+        type: string
       name:
         type: string
+      placeholder:
+        type: string
       required:
         type: boolean
       type: