[feature] function to receive all Pages

**For NextJS SSG all Paths should be known**
When integrating AEM with NextJS it would be really beneficial to make use of SSG. For this to work all Paths need to be fetched upfront.
**Describe the solution you'd like**
The best way to achieve this is a similar function to `fetchModel` but rather `fetchPages`. A good example how this is solved is from the guys at builder.io. Their builder-client offers this functionality in conjunction with revalidation. Here is an example repo
https://stackblitz.com/edit/nextjs-builder?file=pages%2F[[...page]].tsx

**Describe alternatives you've considered**
Alternatively one could leverage SSR which is fine but always brings unwanted requests to publisher for static content.