Use updated fitscube to corm larger than memory cubes

[tjgalvin]

flint uses fitscube to form image cubes out of many single plane fits images. To date this was all done in memory and required sufficient resources. This was not really scalable to combining channel images after linmos was performed.

@AlecThomson has re-worked fitscube to use asyncio and a pre-stashed final fits cube to worker within the memory limitations. This also improves the overall performance.

There was a slight change in some of the API components along the way, but I think these are largely dealt with.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 62.96296% with 30 lines in your changes missing coverage. Please review.

Project coverage is 60.48%. Comparing base (806e944) to head (068f47b).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
flint/prefect/flows/subtract_cube_pipeline.py	17.85%	23 Missing ⚠️
flint/prefect/common/imaging.py	0.00%	6 Missing ⚠️
flint/naming.py	97.61%	1 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #196   +/-   ##
=======================================
  Coverage   60.48%   60.48%           
=======================================
  Files          35       35           
  Lines        6089     6135   +46     
=======================================
+ Hits         3683     3711   +28     
- Misses       2406     2424   +18     

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