terminal-util: add new helper terminal_reset_defensive() that combines reset-by-ioctl and reset-by-sequence reasonably

src/basic/terminal-util.h

@@ -98,6 +98,7 @@ bool isatty_safe(int fd);
 int reset_terminal_fd(int fd, bool switch_to_text);
 int reset_terminal(const char *name);
 int terminal_reset_ansi_seq(int fd);
+int terminal_reset_defensive(int fd, bool switch_to_text);
 
 int terminal_set_cursor_position(int fd, unsigned row, unsigned column);