toward preamble / userCache

[dehann]

xref

• towards achieving Preamble before init w type-safety cache #1462,
• to work properly, will need Replace PackedFactor convert functions with specific function. Two chicken and egg problems, unpack DFGFactor #1424,

[codecov]

Codecov Report

Merging #1466 (7645553) into master (2c93a91) will increase coverage by 0.18%.
The diff coverage is 100.00%.

❗ Current head 7645553 differs from pull request most recent head 4beac24. Consider uploading reports for the commit 4beac24 to get more accurate results

@@            Coverage Diff             @@
##           master    #1466      +/-   ##
==========================================
+ Coverage   77.16%   77.35%   +0.18%     
==========================================
  Files          67       67              
  Lines        4966     5007      +41     
==========================================
+ Hits         3832     3873      +41     
  Misses       1134     1134              

Impacted Files	Coverage Δ
src/entities/FactorOperationalMemory.jl	100.00% <ø> (ø)
src/DispatchPackedConversions.jl	62.16% <100.00%> (+3.33%)	⬆️
src/FactorGraph.jl	69.48% <100.00%> (+1.34%)	⬆️
src/services/CalcFactor.jl	89.92% <100.00%> (ø)
src/TreeMessageAccessors.jl	92.30% <0.00%> (-3.53%)	⬇️
src/SolveTree.jl	97.22% <0.00%> (+0.03%)	⬆️
src/CliqStateMachineUtils.jl	81.25% <0.00%> (+0.09%)	⬆️
src/SerializingDistributions.jl	91.56% <0.00%> (+0.10%)	⬆️
src/ParametricUtils.jl	57.63% <0.00%> (+0.14%)	⬆️
... and 11 more

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