* feat: add method to check for index * tests(sea-orm-migrations): add index to cake name * tests(sea-orm-migrations): check if `has_index` works * Update sea-orm-migration/tests/common/migration/m20220118_000001_create_cake_table.rs * Update Cargo.toml --------- Co-authored-by: Chris Tsang <chris.2y3@outlook.com>