Generalize de_res_to_anndata

[Zethson]

Description of feature

de_res_to_anndata is not flexible enough:

• [ ] Check whether it also works with less columns (no gene names, score, [....]). It must be more flexible to allow for the input of the DE results as generated by pertpy

• [ ] The following must be parameterized

  "params": {
              "groupby": groupby,
              "reference": "rest",
              "method": "other",
              "use_raw": True,
              "layer": None,
              "corr_method": "other",
          },
  

• [ ] Add tests accordingly