Support symbolic arrays in `@mtkmodel` #3447

Job	Run time
SciMLBase.jl/Downstream/1	1m 11s
Catalyst.jl/All/1	1m 11s
CellMLToolkit.jl/All/1	1m 11s
SBMLToolkit.jl/All/1	1m 10s
NeuralPDE.jl/NNPDE/1	50s
DataDrivenDiffEq.jl/Downstream/1	1m 9s
StructuralIdentifiability.jl/All/1	1m 10s
ModelingToolkitStandardLibrary.jl//1	1m 8s
ModelOrderReduction.jl/All/1	59s
MethodOfLines.jl/Interface/1	1m 9s
MethodOfLines.jl/2D_Diffusion/1	1m 9s
MethodOfLines.jl/DAE/1	1m 9s
Ai4EComponentLib.jl/Downstream/1	1m 11s
SciMLBase.jl/Downstream/1.6	1m 10s
Catalyst.jl/All/1.6	1m 10s
CellMLToolkit.jl/All/1.6	1m 12s
SBMLToolkit.jl/All/1.6	1m 10s
NeuralPDE.jl/NNPDE/1.6	55s
DataDrivenDiffEq.jl/Downstream/1.6	1m 11s
StructuralIdentifiability.jl/All/1.6	1m 11s
ModelingToolkitStandardLibrary.jl//1.6	1m 12s
ModelOrderReduction.jl/All/1.6	59s
MethodOfLines.jl/Interface/1.6	1m 13s
MethodOfLines.jl/2D_Diffusion/1.6	1m 12s
MethodOfLines.jl/DAE/1.6	1m 12s
Ai4EComponentLib.jl/Downstream/1.6	1m 10s
	29m 34s

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