[experimental]: Create kitchen-sink Astro example

[ahuseyn]

A kitchen-sink example should be added to the Astro examples directory in new Faust. The example should have the same features as Nextjs all-in-one example:

• Template hierarchy
• Data fetching
• Previews

[ahuseyn]

Working branch: https://github.com/wpengine/faustjs/tree/next-astro-kitchen-sink

[ahuseyn]

Draft PR is here. Waiting #2154 to be merged first