types(query+model): use function overrides instead of | Query<any, any> to support using Query as filter

Fix #15779

Author: vkarpov15

test/types/queries.test.ts

@@ -826,3 +826,20 @@ function gh15671() {
     };
   };
 }
+
+async function gh15779() {
+  type Entity = {
+    id: string;
+    age: number;
+    name: string;
+  };
+
+  function getV8FilterQuery(filter: QueryFilter<Entity>): QueryFilter<Entity> {
+    return { ...filter, deletedAt: null };
+  }
+
+  const v8Filter = getV8FilterQuery({ age: { $gt: 18 } });
+
+  expectAssignable<typeof v8Filter.age>(42);
+  expectNotAssignable<typeof v8Filter.age>('taco');
+}