Sparse LU benchmarking about linearsolve.jl

[j-fu]

Hi, I did some sparse benchmarking:

https://j-fu.github.io/marginalia/julia/scalingtest/

IMHO performance quite a bit depends on structural info, eg 1D/2D/3D. The kron trick used in the notebook gives reasonably typical matrices for scalar FD/FV/FE.

Just gone cycling - will be back at my computer next week.

[ChrisRackauckas]

That would be good to add to the SciMLBenchmarks as well. Could you take the time to PR it today? Shouldn't take more than an hour. I'd still like to see other sparse matrices in a benchmarkable format in order to setup a better default algorithm, but the scaling PDE ones are definitely useful.

[j-fu]

Already on my smartphone... Will PR when I'll be back.

[j-fu]

See #365