feat(storage): add tracing and decorators

[vsharonlynn]

No description provided.

[gemini-code-assist]

Code Review

This pull request introduces support for bidirectional streaming writes (Bidi Write) for appendable objects in the Google Cloud Storage client. It adds new request builders (OpenAppendableObject and ReopenAppendableObject), a background stream worker, and transport/connector logic to manage handshakes and redirects. Feedback on these changes suggests avoiding unnecessary string allocations by passing string literals directly to builder methods, and improving error handling by creating specific error variants instead of wrapping conversion errors in generic I/O errors.

[codecov]

Codecov Report

❌ Patch coverage is 88.33054% with 209 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.52%. Comparing base (5e91002) to head (aed02a5).
⚠️ Report is 25 commits behind head on main.

Files with missing lines	Patch %	Lines
src/storage/src/storage/open_appendable_object.rs	45.04%	111 Missing ⚠️
...rc/storage/src/storage/reopen_appendable_object.rs	68.64%	37 Missing ⚠️
src/storage/src/storage/stub.rs	0.00%	18 Missing ⚠️
src/storage/src/storage/bidi_write/worker.rs	87.50%	16 Missing ⚠️
src/storage/src/storage/bidi_write/connector.rs	98.03%	10 Missing ⚠️
src/storage/src/storage/transport.rs	97.43%	7 Missing ⚠️
src/storage/src/storage/bidi_write/transport.rs	98.01%	6 Missing ⚠️
src/storage/src/storage/bidi_write/redirect.rs	95.50%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5963      +/-   ##
==========================================
- Coverage   97.72%   97.52%   -0.20%     
==========================================
  Files         242      250       +8     
  Lines       60882    62612    +1730     
==========================================
+ Hits        59495    61061    +1566     
- Misses       1387     1551     +164     

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[coryan]

I am not even looking at a 3300+ line of code PR.