chore: tablestore full text search support score normalization (#23255)

Co-authored-by: xiaozhiqing.xzq <xiaozhiqing.xzq@alibaba-inc.com>

api/configs/middleware/vdb/tablestore_config.py

@@ -28,3 +28,8 @@ class TableStoreConfig(BaseSettings):
         description="AccessKey secret for the instance name",
         default=None,
     )
+
+    TABLESTORE_NORMALIZE_FULLTEXT_BM25_SCORE: bool = Field(
+        description="Whether to normalize full-text search scores to [0, 1]",
+        default=False,
+    )