update default pool size to 100

Author: vgvoleg

ydb/aio/query/pool.py

@@ -23,7 +23,7 @@
 class QuerySessionPoolAsync:
     """QuerySessionPoolAsync is an object to simplify operations with sessions of Query Service."""
 
-    def __init__(self, driver: common_utils.SupportedDriverType, size: int = 10):
+    def __init__(self, driver: common_utils.SupportedDriverType, size: int = 100):
         """
         :param driver: A driver instance
         :param size: Size of session pool

ydb/query/pool.py

@@ -25,7 +25,7 @@
 class QuerySessionPool:
     """QuerySessionPool is an object to simplify operations with sessions of Query Service."""
 
-    def __init__(self, driver: common_utils.SupportedDriverType, size: int = 10):
+    def __init__(self, driver: common_utils.SupportedDriverType, size: int = 100):
         """
         :param driver: A driver instance
         """