Example `scls-util` binary that demonstrates showing the headers and statistics

[qnikst]

We want to get some interesting info about the file that was generated, so we can draw conclusions about the technical decision, for example if we need to make blocks smaller or bigger and how that contribute to the speed and properties of the file.

Success criteria: we have a documented options to get information from the file.
The concrete set of the values is to be defined during the implementation