add v10 next-prisma-starter-websockets example

[c-ehrlich]

Relates to #2152

🎯 Changes

Add a full v10 port (no interop) of the next-prisma-starter-websockets example

Builds, passes lint and test, and works fine based on some quick manual testing.

I locked the version of next to 12.2.5 for the time being as there is a type error on the AppRouter until this gets merged into main: vercel/next.js#40391
Once that happens, it should be fine to upgrade to ^12.3.1 or similar.

Also currently the folder name is next-prisma-starter-websockets but the name in package.json is next-starter-websockets. This is how it was in the existing interop example, let me know if you want me to make it consistent, and to what :)

✅ Checklist

• I have followed the steps listed in the Contributing guide.
• If necessary, I have added documentation related to the changes made.
• I have added or updated the tests related to the changes made.

(no tests needed changing)

[vercel]

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Name	Status	Preview	Updated
next-prisma-starter	✅ Ready (Inspect)	Visit Preview	Sep 11, 2022 at 3:18PM (UTC)
www	✅ Ready (Inspect)	Visit Preview	Sep 11, 2022 at 3:18PM (UTC)

[KATT]

Looks great, but CI takes a while (#2528) and I gotta run now. Will merge when I get back and add this test to branch protection settings.

Thank you so much! If you setup github sponsors I'll send you some $$$ :)