Investigate whether CrateStatement should inherit from Doctrine\DBAL\Statement

[coderabbitai]

Context

During the Doctrine DBAL 3 upgrade in PR #122, the statement wrapping now involves three layers:

1. Doctrine\DBAL\Statement (outer)
2. Crate\DBAL\Driver\PDOCrate\CrateStatement (middle)
3. Crate\PDO\PDOStatement (inner)

Investigation Request

Investigate whether CrateStatement should inherit from Doctrine\DBAL\Statement instead of the current composition-based approach to potentially simplify the wrapping architecture.

References

• PR: Support for Doctrine DBAL 3 #122
• Comment: Support for Doctrine DBAL 3 #122 (comment)
• Requested by: @amotl

The issue documents the current three-layer statement wrapping architecture and requests investigation into whether inheritance could simplify this design.