- main feat: adaptation for async enrichment

- added file_type, this will hold the "таблица", "презентация" and so on types
- file source metadata is now taken either from local source or yandex disk.

services/rag/langchain/.env.dist

@@ -10,3 +10,7 @@ YADISK_TOKEN=TOKEN
 ENRICHMENT_SOURCE=local/yadisk
 ENRICHMENT_LOCAL_PATH=path
 ENRICHMENT_YADISK_PATH=path
+ENRICHMENT_PROCESSING_MODE=async/sync
+ENRICHMENT_ADAPTIVE_FILES_QUEUE_LIMIT=5
+ENRICHMENT_ADAPTIVE_FILE_PROCESS_THREADS=4
+ENRICHMENT_ADAPTIVE_DOCUMENT_UPLOADS_THREADS=4