Добавлено логгирование запросов

https://tracker.yandex.ru/AUTO-1332

review @teplyakov

examples/extension_service/server.py

 import grpc
+import logging
 
 from concurrent import futures
 from perxis.collections import collections_pb2_grpc
@@ -11,10 +12,16 @@ from perxis.interceptors import header_adder_interceptor
 from servicer import Servicer
 from constants.extension import get_extension_descriptor
 
+logging.basicConfig(level=logging.INFO)
+
+logger = logging.getLogger(__name__)
+
 
 def main():
     my_extension_descriptor = get_extension_descriptor(host="demo-ext-backend:50051")
 
+    logger.info(f"Инициализация сервиса расширения {my_extension_descriptor.extension}")
+
     interceptor = header_adder_interceptor(
         'x-perxis-access', 'system'
     )
@@ -34,10 +41,16 @@ def main():
                         )
                     )
 
+                    logger.info(
+                        f"Изменилась версия расширения {my_extension_descriptor.extension} ({ext.version} -> {my_extension_descriptor.version})"
+                    )
+
         ext_manager_stub.RegisterExtensions(manager_pb2.RegisterExtensionsRequest(
             extensions=[my_extension_descriptor]
         ))
 
+        logger.info(f"Расширение {my_extension_descriptor.extension} зарегистрировано в perxis")
+
         with grpc.insecure_channel("content:9020") as content_channel:
             intercepted_content_channel = grpc.intercept_channel(content_channel, interceptor)