v1.0.1: Add column visibility configuration and streamline event handling

- Introduced `showColumns` and `minimumCountColumns` options to enable column visibility toggling and enforce a minimum visible column count.
- Updated dropdown UI for better alignment, gradient styling, and dynamic checkbox state management.
- Refactored event handlers (`onLoadSuccess`, `onRefresh`, `onSort`, etc.) with a reusable `executeFunction` helper to reduce duplication and improve readability.
- Enhanced alignment handling for headers, footers, and cells with new `halign` and `falign` options.
- Improved modularity of DOM structure with updated `data-col-index` attributes across the table (header, body, footer).