Additional CSP features to middleware

[ghost]

• I'm submitting a ...
  [ ] bug report
  [x] feature request
  [ ] question about the decisions made in the repository
  [ ] question about how to use this project

• Summary

Similar to #2, add a way to implement a feature a CSP header, including types that help the end user to add things such as https: in 'script-src' https: *.domain.com; referenced from nuxt/security docs' about CSP

• Other information (e.g. detailed explanation, stack traces, related issues, suggestions how to fix, links for us to have context, eg. StackOverflow, personal fork, etc.)

Here are some examples used on a Next.js application using CSP:

• https://github.com/MyFursona-Project/MyFursona/blob/next13-rewrite/apps/website/src/utils/generateCSP.ts
• https://github.com/MyFursona-Project/MyFursona/blob/next13-rewrite/apps/website/src/middleware.ts