fix(postgres): use permanent views to avoid connection pool defeat

ibis/backends/postgres/__init__.py

@@ -198,4 +198,4 @@ def _get_temp_view_definition(
         name: str,
         definition: sa.sql.compiler.Compiled,
     ) -> str:
-        yield f"CREATE OR REPLACE TEMPORARY VIEW {name} AS {definition}"
+        yield f"CREATE OR REPLACE VIEW {name} AS {definition}"