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/admin/atfpp-dashboard/images/csv.svg

@@ -0,0 +1 @@
+<svg width="32" height="32" viewBox="0 0 32 32" fill="none" xmlns="http://www.w3.org/2000/svg"><path d="M21.3334 17.056V21.3333H17.0667V17.056H21.3334ZM21.3334 10.6603V14.9227H17.0667V10.6603H21.3334ZM14.9334 10.6603H10.6667V14.9227H14.9334V10.6603ZM14.9334 17.056H10.6667V21.3333H14.9334V17.056Z" fill="#27AD95"></path><path fill-rule="evenodd" clip-rule="evenodd" d="M2.1333 3.2C2.1333 2.35131 2.47044 1.53737 3.07056 0.937258C3.67068 0.337142 4.48461 0 5.3333 0L22.8416 0L29.8666 7.02507V28.8C29.8666 29.6487 29.5295 30.4626 28.9294 31.0627C28.3293 31.6629 27.5153 32 26.6666 32H5.3333C4.48461 32 3.67068 31.6629 3.07056 31.0627C2.47044 30.4626 2.1333 29.6487 2.1333 28.8V3.2ZM23.4666 8.52693H8.5333V23.4667H23.4666V8.52693Z" fill="#27AD95"></path></svg>