add ability to change elevation of sun parking spot

[ykyohei]

To resolve https://github.com/simonsobs/scheduler/issues/111 Add ability to change elevation of sun parking spot. This is critical for operation in the Chilean summer with larger sun avoidance. We configure the minimum allowed elevation in each policy. Also, added more info in the error log.

This will change the sun avoidace part of schedule like this, if it is necessary to change elevation.

run.wait_until('2024-10-07T14:48:24+00:00')
run.acu.move_to(az=180.0, el=60.0)
run.acu.move_to(az=180.0, el=48)
run.wait_until('2024-10-07T14:53:24+00:00')
run.acu.move_to(az=180.0, el=48)
run.wait_until('2024-10-07T18:57:35.980000+00:00')
run.acu.move_to(az=111.483, el=48)
run.acu.move_to(az=111.483, el=60.0)
run.wait_until('2024-10-07T19:02:35.980000+00:00')
run.acu.move_to(az=111.483, el=60.0)

[mhasself]

I don't see where this actually changes the elevation. Missing a commit?

There's another PR (#108 ) in to set the platform min_el, in a different way, so we're diverging here...

[ykyohei]

@guanyilun Do you have opinion/suggestion on how we converge the treatment of min_el?

[guanyilun]

I'm ok with setting the min_el as part of the sun policy for now. I intend to do a refactoring to provide more direct access to policy configs, so I might change this in the future.