`<typeinfo>`: non-Standard extension `type_info::raw_name`

Describe the bug
The method type_info::raw_name exists, it works and no warning that it is non-Standard is emitted

Command-line test case

#include <iostream>
#include <typeinfo>

using namespace std;

int main()
{
    cout << typeid(cout).raw_name();
}

D:\temp2>cl /W4 /EHsc test.cpp
Microsoft (R) C/C++ Optimizing Compiler Version 19.30.30423 for x64
Copyright (C) Microsoft Corporation.  All rights reserved.

test.cpp
Microsoft (R) Incremental Linker Version 14.30.30423.0
Copyright (C) Microsoft Corporation.  All rights reserved.

/out:test.exe
test.obj

D:\temp2>test
.?AV?$basic_ostream@DU?$char_traits@D@std@@@std@@

Expected behavior
Non Standard method called like _Raw_name() or does not exist

STL version

Microsoft Visual Studio Professional 2022 Preview (64-bit)
Version 17.0.0 Preview 3.1

Additional context

vNext note: Resolving this issue will require breaking binary compatibility. We won't be able to accept pull requests for this issue until the vNext branch is available. See #169 for more information.

Start with the implementation and the type_info::raw_name entry point, then run the provided C++ command-line test case. The issue is complete when this non-Standard API is renamed to _Raw_name() or removed, with the expected compatibility impact handled on the vNext branch.