Add ledger tool command print-file-metadata

[yhchiang-sol]

Summary of Changes

This PR adds a ledger tool subcommand print-file-metadata.

USAGE:
    solana-ledger-tool print-file-metadata [FLAGS] [OPTIONS] [SST_FILE_NAME]

    Prints the metadata of the specified ledger-store file.
    If no file name is unspecified, then it will print the metadata of all ledger files

Example output:

$ ./solana-ledger-tool print-file-info --ledger /mnt/disks/ledger/mainnet/
[/001434.sst] cf_name: meta, level: 0, start_slot: Some(143642862), end_slot: Some(143663961), size: 921933, num_entries: 983
[/001366.sst] cf_name: meta, level: 0, start_slot: Some(143642588), end_slot: Some(143663209), size: 935010, num_entries: 952
[/001284.sst] cf_name: meta, level: 0, start_slot: Some(143642308), end_slot: Some(143662497), size: 856478, num_entries: 910
[/001217.sst] cf_name: meta, level: 1, start_slot: Some(143635799), end_slot: Some(143661855), size: 17901824, num_entries: 24601
[/001435.sst] cf_name: erasure_meta, level: 0, start_slot: Some(143663208), end_slot: Some(143663961), size: 1157783, num_entries: 21389
[/001367.sst] cf_name: erasure_meta, level: 0, start_slot: Some(143662497), end_slot: Some(143663209), size: 1174356, num_entries: 21699
[/001285.sst] cf_name: erasure_meta, level: 0, start_slot: Some(143661853), end_slot: Some(143662497), size: 1105676, num_entries: 20436
...

[ryoqun]

(you got my eyes on this pr. i'll review this later..)

[stale]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[steviez]

Should be fairly rare that we'd need this information but useful to have it available as CLI instead of having to hack the command together

Pull request has been modified.