remove deprecated datasets.py (#3010)

* remove datasets.py

* remove unused reference in v5/__init__.py

* rerun generate_schema_wrapper.py

* update changes.rst

altair/__init__.py

@@ -548,7 +548,6 @@
     "curry",
     "data",
     "data_transformers",
-    "datasets",
     "datum",
     "default_data_transformer",
     "display",

altair/vegalite/v5/__init__.py

@@ -2,8 +2,6 @@
 from .schema import *
 from .api import *
 
-from ...datasets import list_datasets, load_dataset
-
 from ...expr import datum, expr  # type: ignore[no-redef]
 
 from .display import VegaLite, renderers

doc/releases/changes.rst

@@ -50,6 +50,7 @@ Backward-Incompatible Changes
 - Colons in column names must now be escaped to remove any ambiguity with encoding types. You now need to write ``"column\:name"`` instead of ``"column:name"`` (#2824).
 - Removed the Vega (v5) wrappers and deprecate rendering in Vega mode (save Chart as Vega format is still allowed) (#2829).
 - Removed the Vega-Lite 3 and 4 wrappers (#2847).
+- Removed the deprecated datasets.py (#3010).
 - In regards to the grammar changes listed above, the old terminology will still work in many basic cases.  On the other hand, if that old terminology gets used at a lower level, then it most likely will not work.  For example, in the current version of :ref:`gallery_scatter_with_minimap`, two instances of the key ``param`` are used in dictionaries to specify axis domains.  Those used to be ``selection``, but that usage is not compatible with the current Vega-Lite schema.
 
 Maintenance