arrow

GH-45339: [Parquet][C++] Fix statistics load logic for no row group and multiple row groups (#45350)

### Rationale for this change

Loading `arrow::ArrayStatistics` logic depends on `parquet::ColumnChunkMetaData`.

We can't get `parquet::ColumnChunkMetaData` when requested row groups are empty because no associated row group and column chunk exist.

We can't use multiple `parquet::ColumnChunkMetaData`s for now because we don't have statistics merge logic. So we can't load statistics when we use multiple row groups. 

### What changes are included in this PR?

* Don't load statistics when no row groups are used
* Don't load statistics when multiple row groups are used
* Add `parquet::ArrowReaderProperties::{set_,}should_load_statistics()` to enforce loading statistics by loading row group one by one

### Are these changes tested?

Yes.

### Are there any user-facing changes?

Yes.
* GitHub Issue: #45339

Authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>