ideas for new models to be added to the Golovin kernel example

[slayoo]

• https://stammler.github.io/dustpy/test_analytical_coagulation_kernels.html#The-Linear-Kernel
• https://github.com/yoctoyotta1024/CLEO/blob/main/examples/exampleplotting/plotssrc/shima2009fig.py