ARROW-11856: [C++] Remove unused reference to RecordBatchStreamWriter
ARROW-11856: [C++] Remove unused reference to RecordBatchStreamWriter

The type RecordBatchStreamWriter was in a type_fwd but never implemented anywhere.  The proper type would be RecordBatchWriter

Closes #9627 from westonpace/cleanup/arrow-11856

Authored-by: Weston Pace <0dd0706858a011bb30a3fd82b71cee4f9094c502@gmail.com>
Signed-off-by: Antoine Pitrou <9359a4d812173b65a3a0094cd86363e79731a3c2@python.org>

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