Adding covar to PackedVND

Author: GearsAD

src/entities/DFGVariable.jl

@@ -117,6 +117,7 @@ Base.@kwdef mutable struct PackedVariableNodeData
     solveInProgress::Int
     solvedCount::Int
     solveKey::Symbol
+    covar::Vector{Float64}
     _version::String = string(_getDFGVersion())
 end