PerlCheck: check versioned virtual perl dependencies

[arthurzam]

@akhuettel @thesamesam So here it is. A
huge amount of matches across the repo. After some talks on IRC (#-perl) this is done as optional check, so folks need to enable PerlCheck for this result to appear.

I'm fine with any decision (merge or decline), so don't feel obligated 😄

Resolves: #593

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.04 🎉

Comparison is base (2b9b8e7) 79.77% compared to head (59cfd9b) 79.82%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #597      +/-   ##
==========================================
+ Coverage   79.77%   79.82%   +0.04%     
==========================================
  Files          58       58              
  Lines        8652     8673      +21     
  Branches     1966     1972       +6     
==========================================
+ Hits         6902     6923      +21     
  Misses       1648     1648              
  Partials      102      102              

Impacted Files	Coverage Δ
src/pkgcheck/checks/perl.py	100.00% <100.00%> (ø)

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[arthurzam]

So we have:

[23:18:57] <@dilfridge> off by default is ok

So I guess we can continue with this and review before merge...

[thesamesam]

Thank you Arthur!