databendlabs / openraft / 18273107702

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feat: add `RaftStateMachine::try_create_snapshot_builder`

Add `try_create_snapshot_builder(force: bool) -> Option<Builder>` to
allow applications to defer snapshot creation when OpenRaft requests it.
This enables implementations to choose optimal timing for snapshot
building based on I/O load and other factors.

When `force=false`, returning `None` defers the snapshot creation.
When `force=true`, a builder must be returned.

The default implementation calls `get_snapshot_builder()` for backward
compatibility. `get_snapshot_builder` is marked for deprecation.

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