[feature] function to receive all Pages

[Tylopilus]

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.