feat(*): improvements possible by the new resource signal

[glenstaes]

Angular v19 will introduce an experimental resource signal:

• https://riegler.fr/blog/2024-10-18-resources-as-signals
• https://github.com/angular/angular/pull/58255

This functionality might pave the way to make our lives even easier:

• [ ] Investigate the introduction of a new utility paginatedRxResource, automatically listening to the page$ and pageSize$ provided by mixinPagination.
• [ ] Check whether the ppw-async-result component needs adaptations.