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/db_config.sql

@@ -25,6 +25,7 @@ ALTER ROLE db_config_authenticator SET pgrst.openapi_server_proxy_uri = 'https:/
 ALTER ROLE db_config_authenticator SET pgrst.server_cors_allowed_origins = 'http://origin.com';
 ALTER ROLE db_config_authenticator SET pgrst.server_timing_enabled = 'false';
 ALTER ROLE db_config_authenticator SET pgrst.server_trace_header = 'CF-Ray';
+ALTER ROLE db_config_authenticator SET pgrst.url_use_legacy_target_names = 'true';
 ALTER ROLE db_config_authenticator SET pgrst.db_hoisted_tx_settings = 'autovacuum_work_mem';
 
 -- override with database specific setting
@@ -81,6 +82,7 @@ ALTER ROLE other_authenticator SET pgrst.openapi_server_proxy_uri = 'https://oth
 ALTER ROLE other_authenticator SET pgrst.server_cors_allowed_origins = 'http://otherorigin.com';
 ALTER ROLE other_authenticator SET pgrst.server_timing_enabled = 'true';
 ALTER ROLE other_authenticator SET pgrst.server_trace_header = 'traceparent';
+ALTER ROLE other_authenticator SET pgrst.url_use_legacy_target_names = 'true';
 ALTER ROLE other_authenticator SET pgrst.db_hoisted_tx_settings = 'maintenance_work_mem';
 
 create schema postgrest;

test/io/fixtures/privileges.sql

@@ -3,7 +3,7 @@ GRANT USAGE ON SCHEMA test TO postgrest_test_anonymous;
 
 GRANT SELECT ON authors_only TO postgrest_test_author;
 GRANT SELECT ON projects TO postgrest_test_anonymous, postgrest_test_w_superuser_settings;
-GRANT SELECT ON directors, films TO postgrest_test_anonymous, postgrest_test_w_superuser_settings;
+GRANT SELECT ON directors, films, awards TO postgrest_test_anonymous, postgrest_test_w_superuser_settings;
 
 GRANT ALL ON cats TO postgrest_test_anonymous;
 GRANT ALL ON items_w_isolation_level TO postgrest_test_anonymous, postgrest_test_repeatable_read, postgrest_test_serializable;

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