Add random ordering for sort command

[pjsier]

Adds random ordering to sort based on the comments in #181. It looks like the SeedableRng generation could be simplified with seed_from_u64 if rand_core is updated, but I wanted to check before doing that.

I'm pretty new to Rust, so happy to make changes if anything seems off. Thanks for maintaining this!

[PCouaillier]

In your merge request you match on (false, false, true) and otherwise random value must be false. This may be confusing if someone provide --random, --seed and --reverse or --random --numeric (even if it makes no sense we do neither of those two)

We should emit a warning or at least force --random by matching on (_, false, true) and add the reverse pattern (if seed is provided it can make sense) (_, true, true).