[ENH] V1 → V2 API Migration - datasets

[JATAYU000]

Metadata

• Reference Issue: [ENH] V1 → V2 API Migration - datasets #1592

• Depends on: [ENH] V1 → V2 API Migration - core structure #1576

• Change Log Entry:This PR implements Datasets resource, and refactor its existing functions

[codecov-commenter]

Codecov Report

❌ Patch coverage is 57.45721% with 174 lines in your changes missing coverage. Please review.
✅ Project coverage is 53.32%. Comparing base (c5f68bf) to head (96df5e3).

Files with missing lines	Patch %	Lines
openml/_api/resources/datasets.py	31.55%	128 Missing ⚠️
openml/datasets/functions.py	6.66%	14 Missing ⚠️
openml/_api/http/client.py	82.60%	12 Missing ⚠️
openml/_api/resources/tasks.py	87.23%	6 Missing ⚠️
openml/_api/runtime/fallback.py	0.00%	6 Missing ⚠️
openml/_api/runtime/core.py	81.48%	5 Missing ⚠️
openml/_api/__init__.py	75.00%	1 Missing ⚠️
openml/_api/config.py	96.87%	1 Missing ⚠️
openml/tasks/functions.py	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1608      +/-   ##
==========================================
+ Coverage   53.02%   53.32%   +0.29%     
==========================================
  Files          36       46      +10     
  Lines        4326     4645     +319     
==========================================
+ Hits         2294     2477     +183     
- Misses       2032     2168     +136     

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[JATAYU000]

FYI @geetu040 Currently the get_dataset() function has 3 download requirement

• download_data : uses api_calls._download_minio_bucket() to download all the files in the bucket if download_all_files param was True and api_calls._download_minio_file() to download the dataset.pq file if it was not found in cache. When download parquet fails it fallback to download dataset.arff file with get and does checksum
• download_features : does get request and caches the xml and saves the file path to feature_file param in OpenMLDataset
• download_qualities : does get request and caches the xml and saves the file path to qualities_file param in OpenMLDataset

These two features and qualities in v2 would have a json response instead of xml, on top of saving that to cache the file path needs to returned for the OpenMLDataset object, later processing of these files should handle xml/json according the the file path extension since the download could have been xml/json depending on v1/v2