IncrementalInference.jl
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[FEATURE] build linear Gaussian chain rule utility function
A variable elimination game calls for calculating a new conditional from other factors (akin to "smart factors").
cc @Affie
From Kaess et al., "The Bayes Tree: An Algorithmic Foundation for Probabilistic Robot Mapping", 2010
likely useful to #464
https://en.wikipedia.org/wiki/Schur_complement
Would be great to leverage ChainRules.jl for this.