Migrate `sorobandata_builder.js` file to TS

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