Additional improvements to adata_to_multivec_zarr function

[keller-mark]

• Use all chromosomes present in input dataframe.
• Emit warning about chromosomes that are contained in assembly but not in the input dataframe to catch cases in which users are using wrong assembly (and chr prefix differences).
• Reindex in_bins_df prior to for loop

  vitessce-python/vitessce/data_utils/multivec.py

  Line 88 in 83b1411

  for chr_name, chr_len in chrom_name_to_length.items():

  to ensure the index values are integers in range(in_bins_df.shape[0])