[perl] Evaluate reading file headers to deduce compression types

[akotlar]

Background:

A concise description of why we're pursuing this task.

Instead of relying on extension, we can deduce the compression type by checking file headers. File::LibMagic is a Perl package that binds to the c library that seems like it would be a good fit and probably much easier to use than our own implementation for checking magic strings.

Completion Criteria:

What is the goal, and how do we know this task is accomplished?

If File::LibMagic is viable implement the solution. Else propose an alternative implementation and create a following ticket that is linked to this one that describes the implementation.

Implementation Summary

Give enough technical detail for a teammate to understand the proposed solution.

We should evaluate File::LibMagic.