Function newClient

newClient(storeType, name, bucket?): "objectstorage".Client
创建对象存储client, newClient方法里参数不能为变量，否则打包解析不到连接器依赖
Parameters
- storeType: StoreType
  obs/minio/s3
- name: string
  name of connector
- Optional bucket: string
  bucket
Returns "objectstorage".Client