[C++][Parquet] Support limit RowGroup size by bytes.

### Describe the enhancement requested

Could we support limit RowGroup size by bytes (before compression) in addition to RowGroup length (records count) to provide more precisely writing control.

### Component(s)

C++

Begin in the C++ Parquet row-group writing path and compare the existing record-count limit. Identify the public control and relevant writer tests, then verify that a byte-based limit applies to uncompressed row-group data while existing record-count behavior remains intact.

Written by the indexing model from the issue text.