Add a verbose mode to torch api for external data save

[justinchuby]

Show progress bar with tqdm when verbose is True.

[Copilot]

Pull Request Overview

Adds an optional verbose flag to save_model_with_external_data to display progress via tqdm when available.

• Extends function signature with verbose parameter (default False).
• Implements conditional tqdm progress bar callback.
• Introduces dynamic import/tqdm detection logic.

[codecov]

Codecov Report

❌ Patch coverage is 13.33333% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.43%. Comparing base (80f28c9) to head (3fd2986).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
onnxscript/_framework_apis/torch_2_5.py	13.33%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2643      +/-   ##
==========================================
+ Coverage   70.32%   70.43%   +0.10%     
==========================================
  Files         222      224       +2     
  Lines       26438    26585     +147     
  Branches     2632     2639       +7     
==========================================
+ Hits        18593    18724     +131     
- Misses       6926     6940      +14     
- Partials      919      921       +2     

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