Dask support for pp.highly_variable_genes ("seurat_v3" flavor(s))

[flying-sheep]

We should support Dask for the “seurat_v3” flavor. But probably after:

• Dask support for pp.highly_variable_genes (default "seurat" flavor) #2777

• Dask support for pp.highly_variable_genes ("cellranger" flavor) #2807

• sc.pp.highly_variable_genes(adata, flavor="seurat_v3") consistency improvement and implementation discussion #2792

  That one changes to the “seurat_v3” flavor

[ilan-gold]

Waiting on https://dask.discourse.group/t/dask-array-any-memory-behavior/3658/2 for checking non-negative integers