Add modules support (#1015)

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

src/ftxui/component/event.cppm

@@ -0,0 +1,21 @@
+/**
+ * @file event.cppm
+ * @brief Module file for the Event struct of the Component module
+ */
+
+module;
+
+#include <ftxui/component/event.hpp>
+
+export module ftxui.component.event;
+
+/**
+ * @namespace ftxui
+ * @brief The FTXUI ftxui:: namespace
+ */
+export namespace ftxui {
+    using ftxui::ScreenInteractive;
+    using ftxui::ComponentBase;
+
+    using ftxui::Event;
+}