Add newtype wrapper around `IP[v6|v4]`

[lehins]

Ledger uses IP type from iproute package.
It does help with parsing and such, but using that type directly has a couple of issues that need to be fixed:

• Show instance for the type is incorrect, since it produces invalid Haskell:

  ghci> show $ Just (read "2001:db8:00:00:00:00:00:01" :: IPv6)
  "Just 2001:db8::1"

  output should be quoted, since it is a string. It should be:

  ghci> show $ Just (read "2001:db8:00:00:00:00:00:01" :: IPv6)
  "Just \"2001:db8::1\""

  There is no need to attempt and fix this upstream, since such patch would be a big breaking change and would be unlikely accepted. We can fix it however for us, by using a newtype
• It forces us to define orphan instances in Cardano.Ledger.Orphans, which can and should be avoided.

I think the best path forward would be create newtypes with same names while importing original types as qualified. However, it doesn't have to be done this way

[f-f]

I am going with the approach you suggested (which in any case is also how I would have first attempted it 🙂)