defFactorType macro

[Affie]

• Need to still sort out how pack/unpack/convert can work.
  • Design decision is to work with pack / unpack and not convert
• Rename to defFactorType
• upstream PackedSamplableBelief

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 75.19%. Comparing base (05ad44d) to head (72f7c39).
Report is 3 commits behind head on refac/factor.

Files with missing lines	Patch %	Lines
src/services/DFGFactor.jl	0.00%	4 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           refac/factor    #1077      +/-   ##
================================================
- Coverage         75.32%   75.19%   -0.13%     
================================================
  Files                28       28              
  Lines              2399     2403       +4     
================================================
  Hits               1807     1807              
- Misses              592      596       +4     

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[Affie]

Merging to refactor factors branch