utils into CSM states instead, sibling dwn init

[dehann]

Part of work on #910, #754, and newly #954

[codecov-io]

Codecov Report

Merging #955 into master will increase coverage by 1.50%.
The diff coverage is 69.43%.

@@            Coverage Diff             @@
##           master     #955      +/-   ##
==========================================
+ Coverage   61.50%   63.00%   +1.50%     
==========================================
  Files          52       56       +4     
  Lines        4982     5298     +316     
==========================================
+ Hits         3064     3338     +274     
- Misses       1918     1960      +42     

Impacted Files	Coverage Δ
src/IncrementalInference.jl	80.00% <ø> (ø)
src/JunctionTree.jl	68.46% <0.00%> (-4.58%)	⬇️
src/JunctionTreeTypes.jl	28.69% <ø> (+6.39%)	⬆️
src/SolveTree.jl	96.15% <ø> (+29.78%)	⬆️
src/SolverUtilities.jl	33.76% <ø> (+4.87%)	⬆️
src/TreeBasedInitialization.jl	65.59% <0.00%> (-3.35%)	⬇️
src/TreeDebugTools.jl	16.66% <0.00%> (-0.08%)	⬇️
src/TreeMessageAccessors.jl	95.83% <ø> (+0.18%)	⬆️
src/Deprecated.jl	5.27% <1.29%> (-2.62%)	⬇️
src/CliqStateMachineUtils.jl	71.75% <50.00%> (-10.60%)	⬇️
... and 23 more

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