Fix Auto Generate script to consider option files

[tarun-google]

1. Extended Template Auto Generation script to fetch options from files
2. Updated PostgresToIceberg YAML Template with the Auto generate script

[gemini-code-assist]

Summary of Changes

Hello @tarun-google, 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 significantly improves the flexibility and maintainability of template definitions by enabling the auto-generation script to read parameters from external option files. This change allows for better organization and reuse of common parameter sets across different templates. Concurrently, the PostgresToIceberg template has been updated to utilize this new feature and refine its parameter configurations, ensuring consistency and clarity.

Highlights

• Enhanced Template Auto-Generation: The script responsible for auto-generating Java templates from YAML definitions has been extended to now fetch and incorporate options defined in separate YAML files, improving modularity and reusability of parameter definitions.
• Updated PostgresToIceberg Template: The PostgresToIceberg YAML template has been updated to leverage the new option file functionality and includes several refinements to its parameter definitions, such as marking certain parameters as required and updating descriptions.
• New Parameter Types Supported: The auto-generation script now supports additional parameter types including map, enum, and password, allowing for more expressive and secure template definitions.

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[derrickaw]

Can you run that script on the KafkaToBigQuery.yaml and verify everything looks good and include the changes in this PR. Thanks.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.39%. Comparing base (301cd41) to head (d7b777f).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3088      +/-   ##
============================================
- Coverage     50.41%   50.39%   -0.02%     
+ Complexity     5022     5019       -3     
============================================
  Files           970      970              
  Lines         59606    59609       +3     
  Branches       6506     6507       +1     
============================================
- Hits          30051    30042       -9     
- Misses        27434    27441       +7     
- Partials       2121     2126       +5     

Components	Coverage Δ
spanner-templates	70.62% <ø> (-0.03%)	⬇️
spanner-import-export	68.98% <ø> (-0.03%)	⬇️
spanner-live-forward-migration	80.01% <ø> (-0.02%)	⬇️
spanner-live-reverse-replication	77.40% <ø> (-0.07%)	⬇️
spanner-bulk-migration	88.24% <ø> (-0.02%)	⬇️
see 5 files with indirect coverage changes

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