Extend IP normalization to handle various IPv4-embedding formats.

This change introduces NormalizeWithCheckForEmbeddedIPv4Address() which
handles IPv4-mapped, IPv4-compatible (obsolete), NAT64 (RFC 6052),
6to4 (RFC 3056), Teredo (RFC 4380), and ISATAP (RFC 5214) formats.

The IP classification functions (IPIsLoopback, IPIsLinkLocal, etc.)
are updated to use this more thorough normalization to ensure correct
identification of local and private addresses regardless of the
IPv6 embedding format used.

Original Normalized() is kept for backward compatibility and used by
VirtualSocketServer to maintain separation between native and mapped
address families.

In order to make the tests readable, win32.cc has been updated to
support several formats that inet_pton on linux did support, but
the special function in win32.cc did not support.

Bug: webrtc:497635018
Change-Id: I20fe73d77b9f7e534a76ba6f2f271ac3034f7046
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/462843
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Commit-Queue: Harald Alvestrand <hta@webrtc.org>
Auto-Submit: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#47424}