Add PSR HTTP Message Interfaces and Dependencies

- Implemented StreamInterface, UploadedFileInterface, and UriInterface as per PSR standards.
- Added getallheaders function to retrieve HTTP headers in a compatible manner.
- Included LICENSE files for ralouphie/getallheaders and symfony/deprecation-contracts.
- Introduced function for triggering deprecation notices in Symfony.

wp-content/plugins/autopoly-ai-translation-for-polylang-pro/includes/ai-translate/api.php

@@ -0,0 +1,40 @@
+<?php
+/**
+ * API functions.
+ *
+ * @since 0.1.0
+ * @package ai-services
+ */
+
+use ATFPP\AI_Translate\Services\Services_API;
+use ATFPP\AI_Translate\Services\Services_API_Instance;
+
+/**
+ * Returns the AI services API instance, which is used to interact with the AI services.
+ *
+ * Examples:
+ *
+ * ```
+ * atfpp_ai_services()->get_available_service()
+ *   ->get_model( array( 'feature' => 'my-test-feature' ) )
+ *   ->generate_text( 'How can you help me?' )
+ * ```
+ *
+ * ```
+ * atfpp_ai_services()->get_available_service( 'google' )
+ *   ->get_model(
+ *     array(
+ *       'feature' => 'my-test-feature',
+ *       'model'   => 'gemini-1.5-pro',
+ *     )
+ *   )
+ *   ->generate_text( 'How can you help me?' )
+ * ```
+ *
+ * @since 0.1.0
+ *
+ * @return Services_API The API instance.
+ */
+function atfpp_ai_services() {
+	return Services_API_Instance::get();
+}