feat(internal/command): add -v flag

[julieqiu]

librarian now supports a -v flag. When -v is set, the command is printed to stdout.

Fixes #3547

[gemini-code-assist]

Summary of Changes

Hello @julieqiu, 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 enhances the librarian command-line tool by adding a verbose logging option. Users can now enable a -v flag to see the underlying commands being executed by librarian printed to standard error, which can be particularly useful for debugging and understanding the tool's operations.

Highlights

• Verbose Logging Flag: Introduced a global Verbose flag in the internal/command package to control verbose logging for executed commands.
• Command Execution Visibility: Implemented conditional printing of executed commands to stderr within the RunWithEnv function when the Verbose flag is enabled, providing insight into the underlying operations.
• CLI Integration: Added a new -v or --verbose command-line flag to the librarian application, allowing users to easily enable verbose output directly from the CLI.
• Comprehensive Testing: Included comprehensive unit tests for the new verbose functionality, covering both the command execution logic and the CLI flag integration to ensure correctness.

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[gemini-code-assist]

Code Review

This pull request introduces a -v flag for verbose logging, which prints the executed command to stderr. The implementation is clean and includes comprehensive tests for both the new functionality and the flag parsing. My review focuses on improving code clarity and adhering to the repository's Go style guide. I've suggested adding doc comments to exported test functions, using cmp.Diff for test assertions as prescribed, and simplifying a test helper function. I also added a note reinforcing the existing TODO to refactor the global configuration variable, which is a good practice for maintainability.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.47%. Comparing base (3dbe74f) to head (6559f46).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3688      +/-   ##
==========================================
+ Coverage   82.43%   82.47%   +0.03%     
==========================================
  Files         138      138              
  Lines       12657    12660       +3     
==========================================
+ Hits        10434    10441       +7     
+ Misses       1733     1730       -3     
+ Partials      490      489       -1     

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