Feature/add instant handle attributes

[park-jasper]

The following piece of code result in Resharper generating a warning because of a capture that is modified in the outer scope:

[UnionType]
public abstract record Base
{
  public sealed record Number_(int Value) : Base;
  public sealed record Text_(string Value) : Base;
}

...

public void Test()
{
  int value = 5;
  Base b = Base.Number(6);
  value = base.Match(number: number => number.Value, text: _ => value);
}

value is captured in the text parameter, but also edited outside the capture, which can lead to unexpected effects.
In this case we know that .Match does not store the parameter for later, but rather executes it before control is returned to the calling method.
To indicate that to Resharper, the [InstantHandle] attribute can be added before the parameter, which will make the warning not appear.

To not introduce any additional dependency, this is for now only added to the code generated by FunicularSwitch.Generators which will insert it if the JetBrains.Annotations package is already referenced.