Implement beam cut analysis

[vsmagalhaes]

Beam cut analysis are used to estimate pointing errors and optical misalignments in a radio telescope.
This new astrohack tool is expected to:

• Ingest beam cut .holog.zarr files (these in turn being created from mses containing only beam cuts) .
• Produce a .bcut.zarr file containing beam cuts.
• The .bcut.zarr file must be opened into a beamcut_mds.
• The beamcut_mds needs to be able to produce the following results:
  • Plots of the parallel hands versus the offsets in both directions, usually Az and El, but not always.
  • The beam centroid position (gaussian fit is a possibility)
  • The ratio between left and right first side lobes (in dB)
  • Ratio between the first sidelobes and the primary lobe (in dB)
  • The FWHM of the primary beam ()