[PR] refactor(core): remove unused AtomicContentLength util [opendal]

["Xuanwo (via GitHub)" <gi...@apache.org>]

Xuanwo opened a new pull request, #7773:
URL: https://github.com/apache/opendal/pull/7773

   # Which issue does this PR close?
   
   N/A — small dead-code cleanup.
   
   # Rationale for this change
   
   `AtomicContentLength` (`raw::atomic_util`) has no remaining callers after
   the native blocking APIs were removed. It was still compiled and
   re-exported from `raw` on every build, adding dead surface to the core
   crate. A repo-wide search (core, services, layers, bindings, integrations)
   finds zero references outside the module itself.
   
   # What changes are included in this PR?
   
   - Remove `core/core/src/raw/atomic_util.rs`.
   - Drop its `mod atomic_util;` / `pub use atomic_util::*;` from `raw/mod.rs`.
   
   # Are there any user-facing changes?
   
   `AtomicContentLength` was `pub use`-exported from the `raw` module, so this
   technically removes a public item from `raw`. The `raw` module is the
   unstable internal API surface and the type has no users, so the practical
   impact is none. Tag with `breaking-changes` if you prefer to track raw-API
   removals strictly.
   
   # AI Usage Statement
   
   Authored with Claude Code (Claude Opus 4.8). All changes were reviewed by a
   maintainer before submission.
   


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Re: [PR] refactor(core)!: remove unused AtomicContentLength util [opendal]

["Xuanwo (via GitHub)" <gi...@apache.org>]

Xuanwo merged PR #7773:
URL: https://github.com/apache/opendal/pull/7773


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