feat: add MariaDB store

[valtzu]

Related to #28

[chr-hertel]

Awesome! Thanks for working on this.
Just one minor question - and what do you think about adding a compose.yaml to bring MariaDB to the repo for dev setup?

[chr-hertel]

could also be, right?

Suggested change

	"doctrine/dbal": "^4.2",
	"doctrine/dbal": "^3.0 || ^4.0",

we won't see a difference tho without example or test :D

[Copilot]

Pull Request Overview

This PR introduces a MariaDB-based vector store implementation for enhanced retrieval capabilities. Key changes include the addition of a new MariaDB store class with vector search support, an example demonstrating its usage, and corresponding updates to dependency configurations and environment settings.

• Introduced MariaDB store class (Store.php) with methods for adding documents, querying, and initializing the underlying table.
• Added an example usage script to demonstrate similarity search via the MariaDB store.
• Updated composer.json, compose.yaml, and .env for MariaDB integration.

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/Store/Bridge/MariaDB/Store.php	New implementation for MariaDB vector store with query and initialization functions
examples/store/mariadb-similarity-search.php	Example script to demonstrate similarity search using the MariaDB store
composer.json	Dependency updates to support PDO and DBAL for MariaDB support
compose.yaml	Docker configuration for MariaDB 11.7
.env	Environment configuration for connecting to MariaDB

[Copilot]

Consider initializing the $documents array before the foreach loop to ensure clarity and avoid potential undefined variable issues.

Suggested change

	// create embeddings and documents
	// create embeddings and documents
	$documents = [];

[chr-hertel]

Getting this error when executing the example:

PHP Fatal error:  Uncaught Doctrine\DBAL\Exception\DriverRequired: The options "driver" or "driverClass" are mandatory if no PDO instance is given to DriverManager::getConnection().

[chr-hertel]

Let's merge this - thanks @valtzu!