Start transfer of base features to ComradeBase

[ptiede]

No description provided.

[ptiede]

There are a bunch of features from VLBISkyModels that I'd like to move to the base package so people do not necessarily need to depend on VLBISkyModels that is slightly beefy.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 55.69620% with 105 lines in your changes missing coverage. Please review.

Project coverage is 70.64%. Comparing base (538fd10) to head (e0dfb09).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/modifiers.jl	65.00%	63 Missing ⚠️
src/fourierdual.jl	0.00%	30 Missing ⚠️
src/multidomain.jl	65.21%	8 Missing ⚠️
src/domain.jl	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #54      +/-   ##
==========================================
- Coverage   75.11%   70.64%   -4.48%     
==========================================
  Files          18       20       +2     
  Lines         635      872     +237     
==========================================
+ Hits          477      616     +139     
- Misses        158      256      +98     

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