Migrate `address.js` file to TS

- [x] Migrate JS file to TS
- [x] In the `test/unit` directory, add `.test.ts` file using Vitest (keep the `src` structure)
- [x] Make sure all tests pass (old JS and new TS)
- [x] Compare the generated vs hand written declarations contain no regressions
- [x] Remove the old JS tests