Usage show args

Hi,

I have written two patches to display arguments in the usage output.  The patches were originally submitted to the cpan RT[1].  I believe it would (also) close the RT ticket #79982.

Thanks for considering,
~Niels

[1] https://rt.cpan.org/Public/Bug/Display.html?id=84487

NB: I rebased the patches there and merged 0002 and 0003 into one patch.