[rust] BatchScanner: whole-table scan via create_batch_scanner()
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- Dominant language
- Rust
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Description
### Search before asking
- [x] I searched in the [issues](https://github.com/apache/fluss-rust/issues) and found nothing similar.
### Description
Add the no-arg create_batch_scanner() that scans every bucket (and partition) of a table, not just one.
Internally it fans out per-bucket LimitBatchScanners and applies a global limit across them (Java's CompositeBatchScanner).
Reserve the bare name for this, the per-bucket one is create_bucket_batch_scanner.
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- [ ] I'm willing to submit a PR!
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