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GH-45048: [C++][Parquet] Deprecate unused `chunk_size` parameter in `parquet::arrow::FileWriter::NewRowGroup()` (#45088)



### Rationale for this change

Just noticed that the implementation doesn't use the parameter.

### What changes are included in this PR?

Remove the parameter from `NewRowGroup()`

### Are these changes tested?

### Are there any user-facing changes?

The `chunk_size` parameter is now deprecated.

* GitHub Issue: #45048

Lead-authored-by: Krisztian Szucs <szucs.krisztian@gmail.com>
Co-authored-by: Raúl Cumplido <raulcumplido@gmail.com>
Co-authored-by: Sutou Kouhei <kou@cozmixng.org>
Signed-off-by: Raúl Cumplido <raulcumplido@gmail.com>