feat(Platform): implement ProviderFactory and ProviderConfigFactory (RFC #402)

Author: qbejs

src/platform/src/Factory/ProviderFactory.php

@@ -34,7 +34,7 @@ public function fromDsn(string $dsn): object
             };
         } else {
             $factoryMap = [
-                'openai' => \Symfony\AI\Platform\Bridge\OpenAI\PlatformFactory::class,
+                'openai' => \Symfony\AI\Platform\Bridge\OpenAi\PlatformFactory::class,
                 'anthropic' => \Symfony\AI\Platform\Bridge\Anthropic\PlatformFactory::class,
                 'azure' => \Symfony\AI\Platform\Bridge\Azure\OpenAi\PlatformFactory::class,
                 'gemini' => \Symfony\AI\Platform\Bridge\Gemini\PlatformFactory::class,