Make ScanCallback take a struct and update callback function

[OussamaSaoudi-db]

Please describe why this is necessary.

ScanCallback currently takes all the fields of a ScanFile as parameters. This can be cumbersome to write and call.

Describe the functionality you are proposing.

Change ScanCallback so that it takes a struct ScanFile containing all the fields.

To make this change work with FFI, you must also change the rust_callback here to take the ScanFile struct, dustructure it, and pass its fields to the c callback.

Additional context

No response