Allow a Dimension::Fit to extend beyond the terminal maximum height (#950)

For long tables (and other DOM elements), one may want the screen to render on dimensions higher than the terminal.  
Hence, this PR proposes a way to do so, with an optional parameter in the `Dimension::Fit` util function.

Discussions / Issues :  
- https://github.com/ArthurSonzogni/FTXUI/issues/572
- https://github.com/ArthurSonzogni/FTXUI/discussions/949

Bug:https://github.com/ArthurSonzogni/FTXUI/issues/572
Fixed:Bug:https://github.com/ArthurSonzogni/FTXUI/issues/572
Co-authored-by: ArthurSonzogni <sonzogniarthur@gmail.com>

examples/dom/table.cpp

@@ -55,7 +55,8 @@ int main() {
   content.DecorateCellsAlternateRow(color(Color::White), 3, 2);
 
   auto document = table.Render();
-  auto screen = Screen::Create(Dimension::Fit(document));
+  auto screen =
+      Screen::Create(Dimension::Fit(document, /*extend_beyond_screen=*/true));
   Render(screen, document);
   screen.Print();
   std::cout << std::endl;