feat(storage): implement replay buffer for appendable upload

[vsharonlynn]

Issue #5716 .

[gemini-code-assist]

Code Review

This pull request introduces a new ReplayBuffer module to manage unacknowledged data chunks, trim acknowledged data, and support resending chunks upon stream reconnection. The reviewer suggested refactoring the acknowledge method to separate the loop logic and adding a safety comment explaining the invariants when slicing the chunk data.

[codecov]

Codecov Report

❌ Patch coverage is 97.67442% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.72%. Comparing base (f02b42c) to head (cdefb94).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
...rc/storage/src/storage/bidi_write/replay_buffer.rs	97.67%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6605      +/-   ##
==========================================
- Coverage   96.72%   96.72%   -0.01%     
==========================================
  Files         313      314       +1     
  Lines      101266   101438     +172     
==========================================
+ Hits        97948    98112     +164     
- Misses       3318     3326       +8     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[coryan]

Is 32MiB the "One True Value" for some reason? Shouldn't this be configurable? If not, could you add a comment explaining why this is the only correct value?

[vsharonlynn]

No, it's not the one true value. It is the intended default.

Added with_capacity method. Currently default value is 32MiB.
I'll write follow-up PRs on setting this at the request level (and maybe client-level) to keep this PR focused on replay_buffer.rs.

Thanks Carlos.