The page compressedSize printed by the ShowPagesCommand is actually uncompressedSize

It seems that the data page obtained by calling PageReader.readPage() (L122 in ShowPagesCommand) is decompressed, and the bytes obtained by DataPageV1 is decompressed.

**Reporter**: [Yujiang Zhong](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=zhongyuj) / @zhongyujiang
#### Original Issue Attachments:
- [59fa778d-d870-49f2-87f7-046e2e87ef9f.jpeg](https://issues.apache.org/jira/secure/attachment/13066545/59fa778d-d870-49f2-87f7-046e2e87ef9f.jpeg)
- [image-2024-02-07-16-48-08-016.png](https://issues.apache.org/jira/secure/attachment/13066544/image-2024-02-07-16-48-08-016.png)

_{**Note**: *This issue was originally created as [PARQUET-2427](https://issues.apache.org/jira/browse/PARQUET-2427). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*}

Comienza en ShowPagesCommand, en la llamada a PageReader.readPage() indicada en el issue, y luego sigue cómo DataPageV1 expone sus bytes y cómo se imprime compressedSize. Reproduce la salida de tamaño de página del comando y confirma que el valor mostrado representa datos descomprimidos; se considera terminado cuando el tamaño comprimido informado coincide con los datos de página comprimidos.

Escrito por el modelo de indexación a partir del texto del issue.