validate parameters through pydantic

adresses #457

In order to not sink too much repetetive work into changes later found inproper, i for now changed only the type checking in the outliers module to the pydantic process. I would propagate the changes if approved.

Note, that we can get rid of the autodoc-typehints pacakge than (which currently causes some strange rendering bugs at its up to date version).

see #457 for more information on the changes