Add `return_empty_batch` flag to `LimitedBatchCoalescer`

### Is your feature request related to a problem or challenge?

After adding `BatchCoalescer`/`LimitedBatchCoalescer` to Nested Loop Join and Hash Join there is the same issue of having to create a flag to return an empty batch. If the coalescer does not produce any rows then an empty schema will be returned instead of an empty record batch with the join schema.

### Describe the solution you'd like

Add a flag to `LimitedBatchCoalescer` so that when `finish()` is called, it will check:

```
if rows_returned == 0 && coalescer.return_empty_batch {
return RecordBatch::empty()
}
```

### Describe alternatives you've considered

_No response_

### Additional context

_No response_

Start by locating LimitedBatchCoalescer and its finish() implementation, then inspect its use in the Nested Loop Join and Hash Join paths. Confirm how rows_returned and the join schema are handled; done means the new flag causes finish() to return an empty record batch with the join schema when no rows are produced.

Written by the indexing model from the issue text.