net/netip: Add function Network() for netip Addr to make it support the interface of net.Addr

[zhlsunshine]

When replacing the net.IP, net.IPNet and net.Addr with the netip.Addr in net/netip, there is a missing function Network() for netip.Addr to implement the interface of net.Addr.

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Message from Ian Lance Taylor:

Patch Set 1: Hold+1

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