feat(Data Modeling, Time Series): Extend Data Modeling with Time Series /retrieve + /list (DM-3843)

[haakonvt]

Makes it much easier to work with time series created through data modeling by adding a separate API class for it (following in the footsteps of "DM Files" #2665.

[gemini-code-assist]

Code Review

This pull request introduces the DataModelingTimeSeriesAPI (and its sync counterpart) to support retrieving and listing time series nodes. It also refactors the source resolution logic from the files API into a shared utility module _data_modeling.py. Feedback on the changes suggests avoiding bare dict in type hints for the sort parameter in both async and sync list methods to adhere to strong typing principles, and removing a redundant top-level import of AsyncCogniteClient in the sync time series API file to prevent potential circular imports.

[codecov]

Codecov Report

❌ Patch coverage is 98.86364% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.63%. Comparing base (f95510f) to head (32aeb7e).
⚠️ Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
cognite/client/_api/data_modeling/time_series.py	97.22%	1 Missing ⚠️
cognite/client/utils/_data_modeling.py	95.45%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2672      +/-   ##
==========================================
+ Coverage   93.62%   93.63%   +0.01%     
==========================================
  Files         493      498       +5     
  Lines       50100    50245     +145     
==========================================
+ Hits        46905    47046     +141     
- Misses       3195     3199       +4     

Files with missing lines	Coverage Δ
cognite/client/_api/data_modeling/__init__.py	100.00% <100.00%> (ø)
cognite/client/_api/data_modeling/files.py	97.91% <100.00%> (-0.27%)	⬇️
cognite/client/_cognite_client.py	95.76% <100.00%> (+0.03%)	⬆️
cognite/client/_sync_api/data_modeling/__init__.py	100.00% <100.00%> (ø)
cognite/client/_sync_api/data_modeling/files.py	95.23% <ø> (ø)
...nite/client/_sync_api/data_modeling/time_series.py	100.00% <100.00%> (ø)
cognite/client/testing.py	100.00% <100.00%> (ø)
...on/test_api/test_data_modeling/test_time_series.py	100.00% <100.00%> (ø)
...sts_unit/test_api/test_data_modeling/test_files.py	99.34% <100.00%> (-0.05%)	⬇️
tests/tests_unit/test_docstring_examples.py	100.00% <100.00%> (ø)
... and 3 more

... and 6 files with indirect coverage changes

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[haakonvt]

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