Made changes to liana code to update for decoupler-py 2.o

[robinfallegger]

• main changes were in adata_to_views

  • decoupler-py 2.0 changes filtering to be explicit, took the same approach
  • by default adata_to_views does not filter samples or genes
  • arguments can be passed to dc.pp.pseudobulk, dc.pp.filter_samples, dc.pp.filter_by_expr, and dc.pp.filter_by_prop through dictionaries

• took care of changes in decoupler API in the docs

  • Was not able to regenerate docs because of difficult environment definition

• decoupler 2.0 removes the weighted sum method

  • estimate_metalinks depends on run_wmean
    - I did not update this function and it will fail if used