Handle similarity_similarities and similarity_predictions in the pipeline and set lfw_pairs to binary classif (todo: change the labels for omp)

Resolve "Add some tests"

Closes #19

See merge request !21

Update fix of normalize_D in the case of wo weights. Add density plot in compute results for all stages and add some plots in results.

Resolve "Visualization"

Closes #13

See merge request !10

Resolve "integration-sota"

See merge request !20