Feat/maria db

[Yashh56]

This pull request introduces comprehensive testing and CI improvements for MariaDB and MySQL connectors in the bridge package. It adds new end-to-end and cache tests for MariaDB, updates MySQL tests for consistency, and establishes a GitHub Actions workflow to run tests against seeded databases for all three supported engines (Postgres, MySQL, MariaDB).

Testing enhancements for MariaDB and MySQL:

• Added a full suite of cache tests for the MariaDB connector, covering table lists, columns, primary keys, database stats, schemas, table details, cache clearing, and performance metrics in bridge/__tests__/connectors/mariadb.cache.test.ts.
• Implemented end-to-end tests for MariaDB connection, schema creation, data fetching, table listing, and schema retrieval in bridge/__tests__/connectors/mariadb.test.ts.
• Updated MySQL connector tests to align connection status reporting and data fetching with MariaDB, and to use seeded environment variables for database names in bridge/__tests__/connectors/mysql.test.ts. [1] [2]

Continuous Integration improvements:

• Added a new GitHub Actions workflow .github/workflows/test.yml that sets up and seeds Postgres, MySQL, and MariaDB containers, and runs the full test suite against all three engines.

Minor test and code hygiene updates:

• Removed unnecessary console.log statements from MySQL cache performance tests for cleaner output in bridge/__tests__/connectors/mysql.cache.test.ts. [1] [2]
• Added a basic test for MariaDB connection builder to ensure correct delegation and default port usage in bridge/__tests__/connectionBuilder.test.ts.