API Implementation for ResumeAppendableObjectUpload

[rajeevpodar]

This PR adds a new overload for ResumeAppendableObjectUpload that accepts a google::storage::v2::BidiWriteObjectRequest. This allows callers to set specific options on the request, such as flush: true, which were previously inaccessible via the existing overload.

The existing ResumeAppendableObjectUpload overload has been refactored to delegate to this new overload, ensuring consistent behavior and reducing code duplication.

[gemini-code-assist[bot]]

Summary of Changes

Hello @rajeevpodar, I'm Gemini Code Assist[^1]! 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 implements a new asynchronous API, ResumeAppendableObjectUpload, to facilitate the resumption of appendable object upload sessions. This feature enhances the client's ability to handle interrupted uploads gracefully, providing automatic recovery from transient network issues or service disruptions.

Highlights

• New API Implementation: Introduced the ResumeAppendableObjectUpload API for the asynchronous client.
• Functionality: This API enables resuming resumable upload sessions specifically for appendable objects, incorporating automatic recovery from transient failures.
• Client Interface Update: Added a new overload to AsyncClient::ResumeAppendableObjectUpload in client.cc and its corresponding declaration with Doxygen comments in client.h.
• Test Coverage: A new test case, ResumeAppendableObjectUpload2, was added to client_test.cc to validate the new API's behavior, including request parsing and option handling.

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[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 92.94%. Comparing base (2426f6e) to head (49fa97f). :warning: Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15816      +/-   ##
==========================================
- Coverage   92.95%   92.94%   -0.01%     
==========================================
  Files        2458     2458              
  Lines      227589   227628      +39     
==========================================
+ Hits       211559   211575      +16     
- Misses      16030    16053      +23     

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