Add Cool.Version coercer
Add Cool.Version coercer

There is already a Str.Coercer.  It struck me that coercing a number
or a list of numbers to a Version object, would first need coercing
to Str.  Whereas we already do other Cool coercers.  Hence this.

   say 42.Version;                 # v42
   say (1,2,3).Version;            # v1.2.3
   say "42".match(/\d+/).Version;  # v42

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