feat(loggable): replace PHP-serialized array type with json for DBAL 4 compatibility

[Copilot]

• Verify current command integration and Symfony docs in the repository
• Remove DSN support from the command implementation
• Auto-detect the log entry table from Doctrine metadata so --table is no longer needed
• Assess true Symfony autoregistration: not achievable from this library alone without a bundle/recipe, so document the supported behavior
• Run focused validation for the changed PHP code

[Copilot]

Pull request overview

This PR updates the Loggable extension to be compatible with doctrine/dbal 4 by replacing the removed PHP-serialized array column type for AbstractLogEntry::$data with a JSON-based type, and adds guidance/tooling for migrating existing data.

Changes:

• Update LogEntry mapping for data from DBAL array/PHP serialize() storage to DBAL JSON.
• Re-enable Loggable ORM entity tests on DBAL 4 by removing the DBAL-4 skip guard.
• Add migration documentation and a standalone CLI script to convert existing serialized data values to JSON, and track bin/ in git.

Reviewed changes

Copilot reviewed 3 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/Loggable/Entity/MappedSuperclass/AbstractLogEntry.php	Changes the data column mapping from array to JSON (Types::JSON / type="json").
tests/Gedmo/Loggable/LoggableEntityTest.php	Removes the DBAL-4 compatibility skip so tests run on DBAL 4.
doc/loggable.md	Replaces the DBAL-4 incompatibility note with a migration guide section.
bin/migrate-loggable-data-to-json.php	Adds a CLI migration script to rename the legacy column and batch-convert values from unserialize() to json_encode().
.gitignore	Stops ignoring bin/ so the migration script is versioned.

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