Summary of Changes

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This pull request marks a significant update to the librarian tool, advancing its version to 0.5.0. The release encompasses a broad range of new features designed to enhance code generation, streamline release management, and improve the overall developer experience. Alongside these new capabilities, the update also delivers crucial bug fixes that bolster the tool's stability and correctness across various functionalities.

Highlights

• Version Update: The librarian tool has been updated from version 0.4.0 to 0.5.0, signifying a new release with numerous enhancements.
• Performance & Efficiency: Improvements have been made to speed up finding changed files in commits and to avoid work duplication, leading to more efficient operations.
• New Features & Capabilities: Several new features are introduced, including configurable Dart export options, the ability to generate libraries only for changed APIs, options to skip GitHub releases or semver checks for Rust, and new CLI commands like update-image.
• Bug Fixes & Stability: Numerous issues have been resolved, addressing problems with bulk changes, library release flows, commit fetching for new libraries, and various fixes related to sample generation for oneof fields.
• Developer Experience Enhancements: The update includes improvements such as adding documentation for generated service constructors, better sample generation, and the ability to open pull requests as drafts, streamlining the development workflow.

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.71%. Comparing base (dd24921) to head (fb85be8).
⚠️ Report is 2 commits behind head on main.

@@           Coverage Diff           @@
##             main    #2653   +/-   ##
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  Coverage   85.71%   85.71%           
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  Files         108      108           
  Lines       11143    11143           
=======================================
  Hits         9551     9551           
  Misses       1256     1256           
  Partials      336      336           

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