Add option to detect unused using about stylecopanalyzers HOT 7 CLOSED

This is already built in to the compiler as diagnostic IDE0005, but is normally only reported while editing in Visual Studio.
It is possible to enable during builds as well: https://learn.microsoft.com/en-us/dotnet/fundamentals/code-analysis/overview?tabs=net-8#enable-on-build

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There is a difference between the TargetFramework and the SDK used to compile the code.

like @sharwell our product targets .net framework, but we use the .NET 8 SDK to compile it. The latter allows us to use newer C# language features.

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@bjornhellander Yes, I have that activated in the IDE but our proyects are in .NET Framwork, I can not activate it on build.
Thanks anyway.

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@Sebastriani I've worked on numerous .NET Framework targeted projects that have IDE0005 activated on build. I don't understand your comment.

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@sharwell The section of the article that Bjorn mentioned says:
"With the .NET 5 SDK and later versions, you can enable code-style analysis when building from the command-line and in Visual Studio"

And before that, it reads:
"Starting in .NET 5, you can enable code-style analysis on build, both at the command line and inside Visual Studio. Code style violations appear as warnings or errors with an "IDE" prefix. This enables you to enforce consistent code styles at build time."

Since we are using .NET Framework I didn't even bother to try what the article says. Why should I if the official documentation explicity says "starting in .NET5"?

If it works for you in .NET Framework, then the documentation is wrong, I'll try.

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@Sebastriani both of those cases are supposed to read ".NET 5 SDK". There is no limit I'm aware of regarding the target framework of the project itself.

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@manfred-brands @sharwell I didn't know about the SDK being the responsable for compiling or that Rosylin was part of the SDK, I know nothing about Rosylin actually other than it's the compiler... I'll get it working then, thanks.

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