feat: filter top-level resource with embed filter

This is enabled by adding `!inner` to the embedded resource

/projects?select=*,clients!inner(*)&clients.id=eq.12

This behaviour can be enabled by default with the config option

db-embed-default-join='inner'

Which saves the need for specifying `!inner` on every request.
If this is enabled, the previous behavior can be restored
per request by specifying `!left`  on the embedded resource.

/projects?select=*,clients!left(*)&clients.id=eq.12`

Tested on M20/02M/M2M relationships, views, RPC.

test/fixtures/data.sql

@@ -691,4 +691,19 @@ DO $do$BEGIN
     INSERT INTO test.reference_to_partitioned(id) VALUES (1);
     INSERT INTO test.reference_to_partitioned(id, id_a, name_a) VALUES (2, 2, 'first');
   END IF;
-END$do$;
+END$do$;
+
+TRUNCATE TABLE test.products CASCADE;
+INSERT INTO test.products (id, name) VALUES (1,'product-1'), (2,'product-2'), (3,'product-3');
+
+TRUNCATE TABLE test.suppliers CASCADE;
+INSERT INTO test.suppliers (id, name) VALUES (1,'supplier-1'), (2,'supplier-2'), (3, 'supplier-3');
+
+TRUNCATE TABLE test.products_suppliers CASCADE;
+INSERT INTO test.products_suppliers (product_id, supplier_id) VALUES (1,1), (1,2), (2,1), (2,3);
+
+TRUNCATE TABLE test.trade_unions CASCADE;
+INSERT INTO test.trade_unions (id, name) VALUES (1,'union-1'), (2,'union-2'), (3, 'union-3'), (4, 'union-4');
+
+TRUNCATE TABLE test.suppliers_trade_unions CASCADE;
+INSERT INTO test.suppliers_trade_unions (supplier_id, trade_union_id) VALUES (1,1), (1,2), (2,3), (2,4);