MPoL integration w/ CASA Next Generation Infrastructure (CNGI)

[iancze]

Is your feature request related to a problem or opportunity? Please describe.
The next generation of CASA (CNGI) will be able to provide visibilities to external programs as a numpy array or similar easy-to-use format.

In theory, this makes it possible to integrate MPoL into an imaging loop with CNGI, something that is not really feasible with the current versions of CASA.

Describe the solution you'd like
This issue is a stub for furthering the conversation about the design interface. Please comment if you have specific ideas or leads about the integration.

Questions:

• What does the CNGI API provide for external routines?
• Do we need to provide any hooks within MPoL to make this round-trip possible?

Depending on the bridge code that's necessary, we might want to create a separate mpol_cgni package.