add ansi library for sending ANSI escape sequences

ansi.clear_screen()
ansi.set_color(fg)
...

Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@gmail.com>
add test/ansi.kp for Ansi escape sequences testing

Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@gmail.com>