django-rest-framework 框架文件上传demo
参考：
- https://medium.com/@leonelphm/implementando-el-analizador-fileuploadparser-de-django-rest-framework-realizando-peticiones-desde-f59ed3b13d7f
- https://www.trell.se/blog/file-uploads-json-apis-django-rest-framework/
- https://www.django-rest-framework.org/api-guide/parsers/#fileuploadparser
- https://goodcode.io/articles/django-rest-framework-file-upload/
- https://bitbucket.org/levit_scs/drf_base64