feat: Implement Java API integration for PPh 21 calculations and add helper functions for Bupot 21 processing

- Implemented `useGetBulanan` hook for fetching Bulanan data.
- Created `usePphDipotong` hook for handling PPh calculations.
- Added `useSaveBulanan` hook for saving Bulanan data.
- Defined types in `types.ts` for API responses and requests.
- Developed API utility functions in `api.tsx` for fetching and saving data.
- Created `bulananClient.tsx` for Axios instance with interceptors.
- Added utility functions in `utils.tsx` for date and pagination handling.
- Built `BulananListView` for displaying Bulanan records in a data grid.
- Developed `BulananRekamView` for recording new Bulanan entries with form validation.
- Organized view exports in `index.ts` for easier imports.