feat(sqlc-gen-better-python): add GetStudentAndScores query (sqlc-embed)

Author: rayakame

test/queries.sql

@@ -39,4 +39,9 @@ WHERE id = sqlc.arg('id') RETURNING *;
 SELECT sqlc.embed(students), sqlc.embed(test_scores)
 FROM students
          JOIN test_scores ON test_scores.student_id = students.id
-WHERE students.id = ?;
+WHERE students.id = ?;
+
+-- name: GetStudentAndScores :many
+SELECT sqlc.embed(students), sqlc.embed(test_scores)
+FROM students
+         JOIN test_scores ON test_scores.student_id = students.id;