[framework] Add number generator to Rex Text

[Patrick Webster]

Dear msf team,

Can you please, please, pretty please include this in Rex::Text (or
somewhere more appropriate ;-)

 # Generate random bytes of numerical data
 def self.rand_numeric(len, bad='')
  rand_base(len, bad, *('0' .. '9').to_a)
 end

Much appreciated, I'm sure other devs will use it as well..?!

-Patrick
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