Add `sylius:debug:twig-hooks` command to list and inspect Twig hooks.

Features:
- List all hooks with hookable count
- Filter hooks by name (case-insensitive)
- Show hook details with hookables (name, type, target, priority)
- `--all` option to include disabled hookables
- `--config` option to display hookable configuration
- Shell autocompletion for hook names

- Rename $h to $hookable for clarity
- Use VarExporter instead of custom formatValue logic