Добавлен плагин аутентификации

Created by: goshik-e

https://github.com/perxteam/perxis/issues/881

.flake8

+[flake8]
+max-line-length = 120
+inline-quotes = single
+multiline-quotes = double
+avoid-escape = False
+exclude = .git,.tox,.env,.github,.pytest_cache,__pycache__,files,dist,build,*.egg-info,*_pb2.py,*_pb2_grpc.py
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