[feature] add the code for next-authz

need to develop the Next.js middleware for casbin in this repo

needs to have code (apache header year is 2026) and unit tests

need to have CI (use semantic-release and below trigger)

To:
```yaml
on:
push:
branches:
- master
pull_request:
branches:
- master
```

CI only needs to run against Node.js 24 LTS

need to have a README (with badges)

about how to implement, refer to a similar repo: https://github.com/node-casbin/typeorm-adapter