overload DepthScaling and Topmute operators for PhysicalParameter?

[ziyiyin97]

Would it make sense to overload depth scaling and top mute operators? Now the default operation of depth scaling on physical parameter is given in https://github.com/slimgroup/JUDI.jl/blob/f22170d3709bf9f4320190b6915d063570c7e003/src/TimeModeling/ModelStructure.jl#L216 where it directly outputs Julia array. So I guess we can define the operation of depth scaling directly on physical parameters, then follow what we've done for judiWeights https://github.com/slimgroup/JUDI.jl/blob/f22170d3709bf9f4320190b6915d063570c7e003/src/TimeModeling/judiWeights.jl#L203 so that it remains the data structure instead of outputting Julia arrays.

[mloubout]

Don't quote urls or it doesn't render.

Not sure about it, ideally I'd prefer JOLI to work on AbstractVectors, and bot depth scaling and topmute have to be removed from JUDI and put into the preconditionners.