databendlabs / openraft / 19459132859

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refactor: Add `Signal` and `Noop` variant to `IOFlushed`

Extend `IOFlushed` enum with a `Signal` variant that sends the IO result
through a oneshot channel. This provides a lighter-weight alternative to
`Notify` when detailed notification information is not needed.

Changes:
- Add `IOFlushed::Signal` variant that sends `Result<(), io::Error>`
- Add `IOFlushed::signal()` constructor for creating signal callbacks
- Simplify `RaftLogStorageExt::blocking_append()` to use `Signal` instead of `Notify`
- Add unit tests for `Noop` and `Signal` variants

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