feat(cli): add clerk to cli init tool

[Sn0wye]

Closes #1409

✅ Checklist

WIP

• I have followed every step in the contributing guide (updated 2022-10-06).

• I performed a functional test on my final commit

• The PR title follows the convention we established conventional-commit

• Clerk Installer (including middleware)

• tRPC Installer

Templates

tRPC

• src/server/api/trpc.ts
• src/server/api/routers/example.ts

Middleware

• src/middleware.ts

Boilerplates

• src/pages/_app.tsx
• src/pages/index.tsx

Unresolved

• block NextAuth when Clerk is selected

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Changelog

[Short description of what has changed]

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Screenshots

[Screenshots]

💯

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[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🟢 Performance	99
🟢 Accessibility	100
🟢 Best practices	100
🟢 SEO	100
🔴 PWA	30

Lighthouse ran on https://create-t3-app-git-fork-sn0wye-feat-add-clerk-t3-oss.vercel.app/

[FleetAdmiralJakob]

After you resolved the other issues, you could add Clerk also to the T3 Website

[Sn0wye]

Of course i'll do!

[c-ehrlich]

We are not looking to add Clerk to the core stack at the moment.

Really sorry for closing this after it's already basically complete.

The reason is that the core of the T3 Stack should always remain free to use. As much as we like Clerk, we don't want to include a library that is tied to a paid service.

We have talked a few times about maybe building an "add-on" system in the future, and we would consider Clerk for this. If we ever get to that point (it's all just an idea currently) we'd be happy for you to build the one for Clerk (or anything else!).

Again sorry for closing this after you've already put so much work into it.