Feature: Slider in any directions. (#468)

Add the `SliderOption` option supporting:
```cpp
{
  Ref<T> value;
  ConstRef<T> min = T(0);
  ConstRef<T> max = T(100);
  ConstRef<T> increment = (max() - min()) / 20;
  GaugeDirection direction = GaugeDirection::Right;
  Color color_active = Color::White;
  Color color_inactive = Color::GrayDark;
};
```

In particular, this supports multiple direction. This resolves:
https://github.com/ArthurSonzogni/FTXUI/issues/467

This one do not support adding a label. The old constructors can still
be used to have a label.

src/ftxui/component/animation.cpp

@@ -1,4 +1,5 @@
 #include <cmath>    // IWYU pragma: keep
+#include <compare>  // for operator<=, operator>=, partial_ordering
 #include <ratio>    // for ratio
 #include <utility>  // for move