feat: add abby middleware example

[cstrnt]

Description

This PR adds a new example for a Next.js Integration of A/BBY. A/BBY is a service for A/B Testing and Feature Flags with focus on DX. This example uses a middleware as well as SSR/SSG to use Feature Flags and do A/B testing.

Demo URL

https://abby-nextjs-example.vercel.app/

Type of Change

• [x] New Example
• [ ] Example updates (Bug fixes, new features, etc.)
• [ ] Other (changes to the codebase, but not to examples)

New Example Checklist

• [x] 🛫 npm run new-example was used to create the example
• [ ] 📚 The template wasn't used but I carefuly read the Adding a new example steps and implemented them in the example
• [x] 📱 Is it responsive? Are mobile and tablets considered?

[vercel[bot]]

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