[yaml] - add windowing json support

[derrickaw]

Some other transforms support json string. Adding support here to be used in Dataflow templates.

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[gemini-code-assist]

Summary of Changes

Hello @derrickaw, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces the capability to define windowing configurations using JSON strings within YAML specifications. This change aligns the windowing configuration with other transforms that already support JSON strings, making it more versatile and easier to integrate into Dataflow templates by allowing a broader range of input formats for defining windowing behavior.

Highlights

• JSON Support for Windowing: The preprocess_windowing function now supports defining windowing configurations as JSON strings within the YAML specification, enhancing flexibility for Dataflow templates.
• Flexible Parsing Logic: If the windowing configuration is provided as a string, it will be parsed using yaml.safe_load, allowing for both YAML and JSON string formats to be interpreted as a configuration map.
• Robust Error Handling: New error handling has been implemented to catch cases where the provided string for windowing configuration is not a valid YAML/JSON map, raising a ValueError with contextual information.

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 36.33%. Comparing base (423a3c3) to head (5deb67f).
⚠️ Report is 10 commits behind head on master.

Files with missing lines	Patch %	Lines
sdks/python/apache_beam/yaml/yaml_transform.py	0.00%	10 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             master   #37174       +/-   ##
=============================================
- Coverage     55.14%   36.33%   -18.82%     
  Complexity     1676     1676               
=============================================
  Files          1067     1067               
  Lines        167116   167158       +42     
  Branches       1208     1208               
=============================================
- Hits          92163    60736    -31427     
- Misses        72771   104240    +31469     
  Partials       2182     2182               

Flag	Coverage Δ
python	40.61% <0.00%> (-40.16%)	⬇️

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[derrickaw]

Run Python_Runners PreCommit 3.13

[github-actions]

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