Datafusion-cli: when the max rows setting inf, we are missing the unlimited case for bounded streaming.

[zhuqi-lucas]

Describe the bug

#14766

After above improvement, we improved the datafusion-cli memory usage and memory reservation, but we forgot one case:

When the max rows setting inf, we are missing the unlimited case for bounded streaming.

To Reproduce

/usr/bin/time -l cargo run --release --   -m 20G --mem-pool-type fair  --maxrows inf -f '/Users/zhuqi/arrow-datafusion/benchmarks/data/external_sort.sql'

The above will show nothing, because we are not adding unlimited case for bounded streaming to current buffer.

Expected behavior

We should support unlimited case, we can get all the result print.

Additional context

No response