Add modules support (#1015)

Add experimental C++20 module suppport.
Co-authored-by: ArthurSonzogni <sonzogniarthur@gmail.com>

src/ftxui/screen/terminal.cppm

@@ -0,0 +1,26 @@
+/**
+ * @file terminal.cppm
+ * @brief Module file for the Terminal namespace of the Screen module
+ */
+
+module;
+
+#include <ftxui/screen/terminal.hpp>
+
+export module ftxui.screen.terminal;
+
+/**
+ * @namespace ftxui
+ * @brief The FTXUI ftxui:: namespace
+ */
+export namespace ftxui {
+    using ftxui::Dimensions;
+
+    namespace Terminal {
+        using ftxui::Terminal::Size;
+        using ftxui::Terminal::SetFallbackSize;
+        using ftxui::Terminal::Color;
+        using ftxui::Terminal::ColorSupport;
+        using ftxui::Terminal::SetColorSupport;
+    }
+}