Fix S3877 FN: Support for arrow methods

[andrei-epure-sonarsource]

S3877 ExceptionShouldNotBeThrownFromUnexpectedMethods

Should have support for arrow methods.

class ArrowMethods : IDisposable
{
    static ArrowMethods() => throw new Exception(); // FN, needs support for throw expressions
    public void Dispose() => throw new Exception(); // FN
}

[pavel-mikula-sonarsource]

High priority, because it's a very common case in modern C# and it's easy to fix

[pavel-mikula-sonarsource]

It was fixed in #4734 a long time ago