feat: allow spreading one-to-many and many-to-many embedded resources

* Note: Aggregates are not implemented

test/spec/fixtures/schema.sql

@@ -3779,3 +3779,24 @@ CREATE TABLE test.albums (
     ON UPDATE CASCADE
     ON DELETE CASCADE
 );
+
+create table operators (
+  id int primary key,
+  name text,
+  status jsonb
+);
+
+create table process_operator (
+  process_id int references processes(id),
+  operator_id int references operators(id),
+  primary key (process_id, operator_id)
+);
+
+create table factory_buildings (
+  id int primary key,
+  code char(4),
+  size numeric,
+  "type" char(1),
+  factory_id int references factories(id),
+  inspections jsonb
+);