[ENH] V1 → V2 API Migration - setups

[EmanAbdelhaleem]

Fixes #1625
Depends on #1576
Related to #1575

Details
This PR implements Setups resource, and refactor its existing functions

[codecov-commenter]

Codecov Report

❌ Patch coverage is 64.91885% with 281 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.46%. Comparing base (d421b9e) to head (a2e2361).

Files with missing lines	Patch %	Lines
openml/_api/clients/http.py	53.19%	88 Missing ⚠️
openml/_api/resources/base/versions.py	24.71%	67 Missing ⚠️
openml/_api/setup/backend.py	65.16%	31 Missing ⚠️
openml/_api/resources/base/fallback.py	26.31%	28 Missing ⚠️
openml/testing.py	51.11%	22 Missing ⚠️
openml/_api/resources/setup.py	79.45%	15 Missing ⚠️
openml/_api/setup/_utils.py	56.00%	11 Missing ⚠️
openml/_api/setup/builder.py	81.08%	7 Missing ⚠️
openml/setups/setup.py	33.33%	6 Missing ⚠️
openml/_api/resources/base/base.py	78.57%	3 Missing ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1619      +/-   ##
==========================================
+ Coverage   52.04%   54.46%   +2.42%     
==========================================
  Files          36       63      +27     
  Lines        4333     5064     +731     
==========================================
+ Hits         2255     2758     +503     
- Misses       2078     2306     +228     

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[EmanAbdelhaleem]

Running the tests for both files:
tests\test_api\test_setups.py or tests\test_setups\test_setup_functions.py give
openml.exceptions.OpenMLServerException: https://www.openml.org/api/v1/xml/setup/exists/ returned code 103: Authen... for setup_exists related tests.

To reproduce:
pytest tests\test_setups\test_setup_functions.py

[EmanAbdelhaleem]

@geetu040 Ready for review