Add `implicit operator T` to `DefiningConfigKey<T>` that allows you to more easily get the value from it

[Nytra]

public static implicit operator T(DefiningConfigKey<T> key)
{
    return key.GetValue();
}

So for example, the following code would work:

DefiningConfigKey<bool> boolKey = new("Bool Key ID", "Bool Key Description", () => false);

// boolKey implictly calls GetValue() and returns the value.
if (boolKey) {
    // ...
}

This is the same thing that Sync<T> does to let you get the value without needing to actually use the Value property every time.