Add newtype wrappers around IPv4 and IPv6

[f-f]

Description

Fix #607

Checklist

• Commit sequence broadly makes sense and commits have useful messages
• New tests are added if needed and existing tests are updated
• All visible changes are prepended to the latest section of a CHANGELOG.md for the affected packages.
  New section is never added with the code changes. (See RELEASING.md)
• When applicable, versions are updated in .cabal and CHANGELOG.md files according to the
  versioning process.
• The version bounds in .cabal files for all affected packages are updated.
  If you change the bounds in a cabal file, that package itself must have a version increase. (See RELEASING.md)
• Self-reviewed the diff

[lehins]

It would be useful to export conversion functions that allows to wrap with forcing and unwrap the underlying types:

wrapIPv4 :: IP.IPv4 -> IPv4
wrapIPv4 = IPv4

unwrapIPv4 :: IPv4 -> IP.IPv4
unwrapIPv4 = unIPv4

wrapIPv6 :: IP.IPv6 -> IPv6
wrapIPv6 ipv6 = 
  case IP.toIPv6w ipv6 of
    (!w1, !w2, !w3, !w4) -> IPv6 ipv6 

unwrapIPv6 :: IPv6 -> IP.IPv6
unwrapIPv6 = unIPv6

If we did that, then this would be the new implementation of toIPv6w:

toIPv6w :: (Word32, Word32, Word32, Word32) -> IPv6
toIPv6w = wrapIPv6 . IP.toIPv6w

Instead of wrap prefix we could use mk or something else entirely, I don't have any strong preference about it.

We also need to add FromCBOR and ToCBOR instances for those two new types to the cardano-binary.

[f-f]

This should be good for another look

[neilmayhew]

Looks great!

Just a few minor suggestions.

[neilmayhew]

Looking good!

[neilmayhew]

Feel free to resolve my comments while I'm away

[lehins]

Beautiful!
Thank you!