[ENH] V1 → V2 API Migration - evaluations

[EmanAbdelhaleem]

Depends on #1576
Related to #1575

Details

This PR implements Evaluations resource, and refactor its existing functions

[fkiraly]

looks like circular imports

[EmanAbdelhaleem]

@geetu040 We have circular imports here cuz of importing OpenMLEvaluation

Error message:

  File "D:\Work\ESoC\Developing\openML\openml-python\scripts\reproduce_issues.py", line 1, in <module>
    import openml
  File "D:\Work\ESoC\Developing\openML\openml-python\openml\__init__.py", line 21, in <module>
    from . import (
  File "D:\Work\ESoC\Developing\openML\openml-python\openml\evaluations\__init__.py", line 3, in <module>
    from .evaluation import OpenMLEvaluation
  File "D:\Work\ESoC\Developing\openML\openml-python\openml\evaluations\evaluation.py", line 7, in <module>
    import openml.runs
  File "D:\Work\ESoC\Developing\openML\openml-python\openml\runs\__init__.py", line 3, in <module>
    from .functions import (
  File "D:\Work\ESoC\Developing\openML\openml-python\openml\runs\functions.py", line 32, in <module>
    from openml.tasks import (
  File "D:\Work\ESoC\Developing\openML\openml-python\openml\tasks\__init__.py", line 3, in <module>
    from .functions import (
  File "D:\Work\ESoC\Developing\openML\openml-python\openml\tasks\functions.py", line 15, in <module>
    from openml._api import api_context
  File "D:\Work\ESoC\Developing\openML\openml-python\openml\_api\__init__.py", line 1, in <module>
    from openml._api.runtime.core import APIContext
  File "D:\Work\ESoC\Developing\openML\openml-python\openml\_api\runtime\core.py", line 10, in <module>
    from openml._api.resources import (
  File "D:\Work\ESoC\Developing\openML\openml-python\openml\_api\resources\__init__.py", line 2, in <module>
    from openml._api.resources.evaluations import EvaluationsV1, EvaluationsV2
  File "D:\Work\ESoC\Developing\openML\openml-python\openml\_api\resources\evaluations.py", line 8, in <module>        
    from openml.evaluations.evaluation import OpenMLEvaluation
ImportError: cannot import name 'OpenMLEvaluation' from partially initialized module 'openml.evaluations.evaluation' (most likely due to a circular import) (D:\Work\ESoC\Developing\openML\openml-python\openml\evaluations\evaluation.py)```