feat(SyntheticTimeSeries): add optional timezone argument to the query method

[andreolefirenko]

Description

This PR introduces an optional timezone argument to the SyntheticDatapointsAPI.query method, aligning it with the API specification.
https://api-docs.cognite.com/20230101/tag/Synthetic-Time-Series/operation/querySyntheticTimeseries

Checklist:

• Tests added/updated.
• Documentation updated. Documentation is generated from docstrings - these must be updated according to your change.
  If a new method has been added it should be referenced in cognite.rst in order to generate docs based on its docstring.
• The PR title follows the Conventional Commit spec.

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[codecov]

Codecov Report

❌ Patch coverage is 57.14286% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.86%. Comparing base (e2f06c0) to head (c0aebe1).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
cognite/client/_api/synthetic_time_series.py	57.14%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2465   +/-   ##
=======================================
  Coverage   48.86%   48.86%           
=======================================
  Files         191      191           
  Lines       26152    26156    +4     
=======================================
+ Hits        12778    12781    +3     
- Misses      13374    13375    +1     

Files with missing lines	Coverage Δ
cognite/client/_api/synthetic_time_series.py	73.39% <57.14%> (+0.06%)	⬆️

... and 3 files with indirect coverage changes

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[haakonvt]

In the existing datapoints methods I see we allow more than just str | None: str | datetime.timezone | ZoneInfo | None. There is existing utility to handle this so I guess you should do the same here. You can look up convert_timezone_to_str

[haakonvt]

LGTM! Thanks for fixing!

[haakonvt]

🦄