interfaces and pkg extensions for KrilovKit and ArnoldiMethods, potential deprecation of Arpack

[Krastanov]

Arpack v0.5.4 has been causing issues in the entire Julia ecosystem (starting from here and all the related issues JuliaLinearAlgebra/Arpack.jl#120 )

We have put our compat bounds for Arpack to 0.5.0 - 0.5.3

We should really have a way to swap between these three for every place where they are used:

• KrilovKit
• ArnoldiMethod
• Arpack

Then benchmark each, document the results both in the docs and in docstrings, and set the best defaults

Related:

• krylov methods #364
• Direct steadystate solver #338
• Steady State solver #252
• KrylovKit spectrum solver #367
• krylov methods #364 (comment)