ENH: support for COSMIC2 IVM

[jklenzing]

Is your feature request related to a problem? Please describe. Data is public at cdaac.

Describe the solution you'd like New instrument

• platform = 'cosmic2'
• name = 'ivm'
• inst_id = ['ce1', ce2', ... , 'ce6']
• tag = ''

Associated constellation object

Describe alternatives you've considered Data is stored for all six spacecraft as a zip file, only need to download once. Need to think about constellation workflow.

Additional context Needed in support of current project. :smirk_cat:

[jklenzing]

Plan for moving forward: download will grab all files, organize accordingly. Add an info-level logging statement that all satellites will be updated. May need to use update_files=True as default for all instruments to make sure each single spacecraft is updated.