Points improvements and multi-scale image fix

[keller-mark]

Fixes #61

• Depends on Feature_name and feature_index colum names for points vitessce#2390
• Depends on Version bump vitessce-python#490

[keller-mark]

TODO:

• Address Support loading Parquet data via sdata_store vitessce-python#491
• Currently, the blobs notebook runs into the "Multiple tables with different numbers of variables" error. To resolve this, we need to address this TODO comment

  easy_vitessce/src/easy_vitessce/spatialdata_plot.py

  Line 59 in e682bfc

  # Maybe force the user to configure something like ev.config.set({ "sdata_pl_use_element_name_for_entity_types": True })?

  and add a configuration option so that the user can opt-in to using their column name or element name or table name as the vitessce obsType/featureType value. Perhaps we should provide all 3 options (column name, element name, table name. we may need to append _obs/_var suffices if element/table name)
• Ensure the featureList is coordinated as expected for points