Adapt to field-related API changes in pystencils

 - Replace `SfgSymbolLike` by `SfgKernelParam`
 - Update postprocessing to work with parameter properties
 - Add tests

Squashed commit of the following:

commit d017185f
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Wed Oct 23 10:13:06 2024 +0200

    adapt to KernelParameter API changes

commit b2857481
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Tue Oct 22 15:14:01 2024 +0200

    don't ignore the type

commit 6d02cb47
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Tue Oct 22 15:12:49 2024 +0200

    Adapt field parameter collection to changes in pystencils.