add: config to emit warning for legacy target names

Adds the `url_use_legacy_target_names` config.

Enabled (default):
* It allows using the resource name in filters,
  orders or limits when it has an alias, e.g.
  `table?select=alias:target(*)&target.id=eq.1`
* Logs a WARNING with a hint to use the alias
* Returns a Warning header in the response

Disabled:
* It returns an error, only the alias is allowed
* No warnings returned

This feature is deprecated

test/io/fixtures/schema.sql

@@ -25,6 +25,14 @@ CREATE TABLE films (
     on delete cascade
 );
 
+CREATE TABLE awards (
+  id int primary key,
+  name text,
+  year int,
+  film_id int references films(id),
+  director_id int references directors(id)
+);
+
 -- data to test resource embedding
 TRUNCATE TABLE directors CASCADE;
 INSERT INTO directors