Use the SciMLStructures Tunable interface

[ChrisRackauckas]

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This uses the SciMLStructures Tunable interface https://github.com/SciML/SciMLStructures.jl in order to allow more generalized definitions of p.

• [ ] Ensure Lux.jl is well supported (componentarrays extension in SciMLStructures
• [ ] Add a test for a custom SciMLStructure

[ArnoStrouwen]

You need to actually pass repack? https://github.com/SciML/SciMLSensitivity.jl/blob/dcf961ad5739be4167877a25bc6ec6fb36198cb7/src/concrete_solve.jl#L219

[ChrisRackauckas]

Yeah this isn't quite done. We should do a branch of, if it's a mutable structure then we just use replace!(::AbstractPortion, p::T1, new_values), and only repack if it's immutable.

[ArnoStrouwen]

Something isn't completely clicking with me, how this change can be so simple. Where is the logic living that when in the adjoint equations df/dp and dg/dp occurs, we should only take the tunable parameters?

[ChrisRackauckas]

I should've marked WIP. Plan to finish it during today.

[xtalax]

Can we expect this to be released by Monday?

[ChrisRackauckas]

yes