Handling of lunar telescope data

[jpober]

pyuvsim (and maybe one day, real telescopes!) can produce data from lunar surface. pyuvdata should have a way to understand that telescopes are not on the earth (extra keyword "world" seems to be how pyuvsim handles it) but then also needs to have warnings/errors/updated methods for things that assume terrestrial observatory (e.g. phasing and uvw calculations)

[bhazelton]

on the 7/28/22 telecon we decided to add a telescope_frame parameter to the UVData and Telescope objects. The default should be itrs (the frame that astropy EarthLocation objects are defined in).

[aelanman]

The equivalent in lunarsky would be MCMF.

[bhazelton]

This has mostly been fixed, but I found one more problem in utils.calc_app_coords where the frame wasn't getting passed into get_lst_for_time.