Add part size, table size in the metadata.json

[minguyen9988]

From how I see it, we should structure the code into 3 phase

• Collect information
• Planning
• Do the actual action (download upload restore backup)

To do planning methodically and accurately we need to have as much metadata about the part/table/server as possible.

In this issue I want to add part size to better plan for incremental/hardlink download/restore.

[Slach]

too common issue, provide more concrete implementation