Added some options to improve performance on sqlite

[erseco]

This pull request introduces a new Doctrine middleware to automatically tune SQLite connections for better concurrent performance in development environments. The middleware applies several PRAGMA settings to SQLite connections, and its behavior is covered by new integration tests. Configuration files are updated to enable the middleware and improve transaction handling.

SQLite Middleware and Configuration Improvements

• Added SqlitePragmaMiddleware in src/Doctrine/Middleware/SqlitePragmaMiddleware.php, which applies optimized PRAGMA directives (WAL mode, busy timeout, foreign keys, etc.) to all SQLite connections for improved concurrency and reliability.
• Registered the middleware in the Symfony service container (config/services.yaml) so it is automatically applied to all Doctrine connections.

Doctrine Configuration Enhancements

• Enabled use_savepoints in config/packages/doctrine.yaml to improve transaction handling, especially for nested transactions in SQLite.

Testing for Middleware Behavior

• Added SqlitePragmaMiddlewareTest in tests/Integration/Doctrine/SqlitePragmaMiddlewareTest.php to verify that the middleware applies the correct PRAGMA settings and supports concurrent writers without lock errors.

IMPORTANT! Integrity fixes detected and resolved

During integration testing with the new SQLite middleware, several integrity constraint issues were detected in entity relationships (mainly missing cascading deletes).
These have been fixed by adding onDelete="CASCADE" to the relevant associations, ensuring consistent cleanup of related entities and preventing orphaned records.

[erseco]

This change helped to detect some integrity constraint violations