Return client version from Composer in LitebasePDO

[tlaverdure]

This pull request updates how the LitebasePDO class reports its client and server version attributes, ensuring they reflect the actual package version from Composer metadata. It also adds a unit test to verify this behavior.

Version reporting improvements:

• The getAttribute method in LitebasePDO now returns the actual package version for both PDO::ATTR_CLIENT_VERSION and PDO::ATTR_SERVER_VERSION, using Composer's InstalledVersions API instead of a hardcoded '0.0.0' string. (src/LitebasePDO.php, src/LitebasePDO.phpL71-R73)
• A new protected method getClientVersion() was added to encapsulate fetching the version from Composer. (src/LitebasePDO.php, src/LitebasePDO.phpR86-R93)
• The Composer\InstalledVersions class is now imported to support version lookup. (src/LitebasePDO.php, src/LitebasePDO.phpR7)

Testing:

• Added a unit test to ensure the reported client and server versions are non-empty strings and match each other, verifying the new version reporting logic. (tests/Unit/LitebasePDOTest.php, [1] [2]