Support has_database_privilege function (#182)

* Support has_database_privilege function

Add support for the has_database_privilege function.

* Run cargo fmt

Author: mjgarton

datafusion-postgres/src/pg_catalog.rs

@@ -1192,6 +1192,9 @@ pub fn setup_pg_catalog(
     session_context.register_udf(has_privilege_udf::create_has_privilege_udf(
         "has_schema_privilege",
     ));
+    session_context.register_udf(has_privilege_udf::create_has_privilege_udf(
+        "has_database_privilege",
+    ));
     session_context.register_udf(has_privilege_udf::create_has_privilege_udf(
         "has_any_column_privilege",
     ));