Parallel Viewer

A viewer which is capable of rendering larger meshes will be needed in the future (see https://github.com/Ferrite-FEM/Ferrite.jl/pull/486). Not sure how to handle this one yet. For really large problems this mights require something like the Vulkan external memory extension (https://registry.khronos.org/vulkan/specs/1.0-extensions/html/vkspec.html#synchronization-device-group) in Makie.

Edit: It might make sense to have two viewers. One which just merges all parallel solutions on one processes with shared memory processing tools and one truely distributed viewer for really large simulations.