Add honggfuzz coverage-based minimizer.

[pventuzelo]

@robertswiecki has implemented a coverage-based minimizer in honggfuzz recently.

google/honggfuzz#195 (comment)

It will be awesome to have this feature available over cargo like:
cargo hfuzz cmin ...

[Byter09]

I just looked at the usage and it has a --minimize option, but the packed honggfuzz version in this crate is not up-to-date yet. Would this suffice @pventuzelo? If so, should be a simple fix.

[pventuzelo]

Yes i think it should work well just by providing this option flag ;)
Thx @Byter09

[Byter09]

This is making progress in form of google/honggfuzz#379 and google/honggfuzz#380. Can't wait for that to land in here. 🥳

[drahnr]

I'll take a stab at it once #54 is merged and #52 is concluded.