fix: try to handle unknow documents as .robot files to support resources as .txt or .tsv files

Author: d-biehl

robotcode/language_server/robotframework/parts/documents_cache.py

@@ -131,7 +131,7 @@ async def __get_document_type(self, document: TextDocument) -> DocumentType:
         elif suffix == ".resource":
             return DocumentType.RESOURCE
         else:
-            return DocumentType.UNKNOWN
+            return DocumentType.GENERAL
 
     async def get_tokens(self, document: TextDocument, data_only: bool = False) -> List[Token]:
         if data_only: