**Description:**
This implements something similar to `__snapshots__` of `jest`. Instead of storing the expected result as a string literal, we now store it in `$crate/tests/__swc_snapshots__/$path_to_test__$test_name.js`.
**Related issue:**
- Closes#4509
**Description:**
- New: `cargo build --release 478.59s user 19.16s system 814% cpu 1:01.09 total`
- Prev: `cargo build --release 495.60s user 18.89s system 742% cpu 1:09.26 total`