[Datasets] Add documentation for bulk parquet read API and file metad…

…ata providers. (#24354)

API doc updates for #23179 and #24094. All data docs related to #23179 should be up-to-date once this PR and #24203 are merged.

doc/source/data/package-ref.rst

@@ -12,6 +12,7 @@ Creating Datasets
 .. autofunction:: ray.data.read_csv
 .. autofunction:: ray.data.read_json
 .. autofunction:: ray.data.read_parquet
+.. autofunction:: ray.data.read_parquet_bulk
 .. autofunction:: ray.data.read_numpy
 .. autofunction:: ray.data.read_text
 .. autofunction:: ray.data.read_binary_files
@@ -123,6 +124,18 @@ Custom Datasource API
 .. autoclass:: ray.data.ReadTask
  :members:
 
+Datasource File Metadata API
+---------------------
+
+.. autoclass:: ray.data.datasource.FileMetadataProvider
+ :members:
+
+.. autoclass:: ray.data.datasource.BaseFileMetadataProvider
+ :members:
+
+.. autoclass:: ray.data.datasource.ParquetMetadataProvider
+ :members:
+
 Built-in Datasources
 --------------------