Visualize AG status

This ticket is based on the discussion at the commissioning telecon in Dec 2021.

AG status should be displayed in real time not only on gen2, but also on PFS internal. For example, 

• Mosaiced images of 6 cameras, overlaying measured/predicted positions and highlighting the used stars.
• It is nice to correct orientation of these images to match the sky.
• Plot to show how well guiding is working.
• Others useful diagnosis