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/load/fixtures.sql

@@ -33,7 +33,6 @@ CREATE TABLE test.roles (
   character TEXT
 );
 
-
 CREATE TABLE test.authors_only ();
 
 CREATE FUNCTION test.call_me (name TEXT) RETURNS TEXT