[PR] feat(core): complete copy_with_if_match implementation [opendal]

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

YuangGao opened a new pull request, #7627:
URL: https://github.com/apache/opendal/pull/7627

   ## Which issue does this PR close?
   
   Follow-up on #7090 / #7600.
   
   ## Rationale for this change
   
   #7600 left three loose ends:
   1. No `.if_match()` builder on `FutureCopy` / `FutureCopier` — callers had to drop down to `CopyOptions`.
   2. The `capability-check` layer only validated `copy_with_if_not_exists`, not `copy_with_if_match` (the inner `correctness_check.rs` already did both).
   
   
   ## What changes are included in this PR?
   - `FutureCopy::if_match(&str)` and `FutureCopier::if_match(&str)`, mirroring `if_not_exists(bool)`.
   - `copy_with_if_match` check in the `capability-check` layer.
   - `test_copy_with_if_match_match` / `_mismatch` in `core/tests/behavior/async_copy.rs`.
   
   ## Are there any user-facing changes?
   
   Yes, additive only — `op.copy_with(from, to).if_match(etag)` is a new convenience builder. Existing API surface is unchanged.
   
   ## AI Usage Statement
   
   AI-assisted implementation.


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Re: [PR] feat(core): complete copy_with_if_match implementation [opendal]

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

Xuanwo merged PR #7627:
URL: https://github.com/apache/opendal/pull/7627


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