LibVT: Implement Bracketed Paste Mode

This mode allow us to escape any data that was not directly typed by the
user. `vim` currently uses this. If we implement it in the shell, we
could prevent newlines from being injected into the shell by pasting
text or dragging files into it (see #7276).

Userland/Libraries/LibVT/TerminalWidget.h

@@ -118,6 +118,8 @@ private:
 
     void set_logical_focus(bool);
 
+    void send_non_user_input(const ReadonlyBytes&);
+
     Gfx::IntRect glyph_rect(u16 row, u16 column);
     Gfx::IntRect row_rect(u16 row);