Support for vcxproj/sln projects

Environment

• OS and Version: Windows 11
• VS Code Version: 1.74.0-insider
• C/C++ Extension Version: v1.13.3

I'm trying to use vscode with C++ projects originally created in Visual Studio. These projects are configured via .sln and .vcxproj files. The code navigation is very limited. I cannot "go to definition" or "go to delcaration" when those definitions and declarations are in other files. I believe this is because cpptools doesn't parse vcxproj and sln files in the same way that it parses compile_commands.json databases or other similar files.

Bug Summary and Steps to Reproduce

Bug Summary:
"go to definition" or "go to delcaration" does not work when those definitions and declarations are in other files. This occurs in projects based on .vcxproj files

Steps to reproduce:

1. Open a vcxproj/sln based project
2. Click "Go To Declaration"
3. editor doesnt show dclaration

Expected behavior

Ability to fully use all features that rely on cpptools knowing how the project is compiled.

Code sample and Logs

`c_cpp_properties.json`:

{
    "configurations": [
        {
            "name": "Win32",
            "includePath": [
                "${workspaceFolder}/**"
            ],
            "defines": [
                "_DEBUG",
                "UNICODE",
                "_UNICODE"
            ],
            "windowsSdkVersion": "10.0.22621.0",
            "compilerPath": "C:/Program Files/Microsoft Visual Studio/2022/Enterprise/VC/Tools/MSVC/14.34.31933/bin/Hostx64/x64/cl.exe",
            "cStandard": "c17",
            "cppStandard": "c++17",
            "mergeConfigurations": true
        }
    ],
    "version": 4
}

### Screenshots

_No response_

### Additional context

_No response_

Inizia riproducendo il malfunzionamento con il progetto .sln e .vcxproj segnalato e la configurazione c_cpp_properties.json mostrata, seguendo i passaggi di Go To Declaration. Confronta il modo in cui questi progetti forniscono le informazioni di compilazione con il supporto per compile_commands.json. Il lavoro è completato quando vengono trovate dichiarazioni e definizioni in altri file e le funzionalità pertinenti di cpptools funzionano per i progetti Visual Studio.