Set page buffer size to non-zero value for ROS3 driver

[ajelenak]

Library's page buffer is available for all files created with page aggregation file space management strategy. The current default page buffer size is zero bytes. Page buffer is shown to significantly improve performance for cloud optimized files so I propose to set its size to a non-zero value when ROS3 driver is used. Suggested page buffer size: 64 MiB.