Set join-lookup limit (#6455)

Author: ssmike

ydb/core/protos/table_service_config.proto

@@ -279,7 +279,7 @@ message TTableServiceConfig {
     optional bool EnablePerStatementQueryExecution = 56 [default = false];
     optional bool EnableCreateTableAs = 57 [default = true];
 
-    optional uint64 IdxLookupJoinPointsLimit = 58 [default = 1];
+    optional uint64 IdxLookupJoinPointsLimit = 58 [default = 3];
     optional bool OldLookupJoinBehaviour = 59 [default = false];
 
     optional bool EnableOltpSink = 60 [default = false];