[rust] Add into_stream() to bounded readers#3664
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closes #3665
Adds into_stream(self) -> impl Stream<Item = Result> to RecordBatchLogReader and LimitBatchScanner.
A try_unfold over the existing next_batch(), so async consumers (DataFusion) can drive the bounded readers as a Stream.
Yields ScanBatch (keeps bucket/offset) and stays a plain futures::Stream, no datafusion dep in core, so the caller wraps it.
Dropping the stream reuses the reader's existing cleanup.