define new command for calibration and unload filament
Change-Id: I834680740b4052d5719193a40945ca2704a3d858
Signed-off-by: Stone Li <stone.li@bambulab.com>
(cherry picked from commit c742fb5feb26938152858c44056d809fe18ce742)
Signed-off-by: Stone Li <stone.li@bambulab.com>