net/netip: add a fuzz test

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This is a pretty straight port of the fuzz test at https://github.com/inetaf/netaddr.

The MarshalText methods of netip.Addr and net.IP, the Is* methods of netip.Addr
and net.IP and the MarshalText and String methods of netip.Addr are also
checked to ensure that they behave the same way.

Fixes #49367

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