new distance: wasserstein and universal divergence

src/legacy_abc/analysis/abc_distances.py

src/legacy_abc/analysis/distances/distance.py

src/legacy_abc/analysis/distances/scalings_des.py

src/legacy_abc/analysis/distances/scalings_hsc.py

src/legacy_abc/analysis/distances/scalings_utils.py

src/legacy_abc/analysis/simulate.py