Giovana Motta

Add values_to_plot support to matrixplot and heatmap (issue #3842)

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This PR adds `values_to_plot` support for `rank_genes_groups_matrixplot` and `rank_genes_groups_heatmap`, addressing issue #3842. I implemented a small wrapper module (`_rank_genes_groups.py`) that extracts the selected differential expression metric (`scores`, `logfoldchanges`, `pvals`, or...