info sql tool remove whitespaces in table names (langchain-ai#13712)

Remove whitespaces from the input of the ListSQLDatabaseTool for better
support.
for example, the input "table1,table2,table3" will throw an exception
whiteout the change although it's a valid input.

---------

Co-authored-by: Harrison Chase <hw.chase.17@gmail.com>

libs/langchain/langchain/tools/sql_database/tool.py

@@ -60,7 +60,9 @@ def _run(
         run_manager: Optional[CallbackManagerForToolRun] = None,
     ) -> str:
         """Get the schema for tables in a comma-separated list."""
-        return self.db.get_table_info_no_throw(table_names.split(", "))
+        return self.db.get_table_info_no_throw(
+            [t.strip() for t in table_names.split(",")]
+        )
 
 
 class ListSQLDatabaseTool(BaseSQLDatabaseTool, BaseTool):