Prisma: Improve binary downloading/distribution

[janpio]

Current possible problems:

1. ~Hardcoded S3 URL~
2. No fallback when server unavailable
3. ~No CDN geolocation thing~
4. No alternative download location: https://github.com/prisma/prisma2/issues/1333

Notes:
off-site DA for S3, GH releases, CNAME

[pantharshit00]

I think GH releases should be a good option here. Many projects like election use it for binary distribution: https://github.com/electron/electron/releases

Also, you can get download stats using it:

(these are enabled by refined github but you can also get them via API)

[pantharshit00]

Electron also has a package for this that we can use as an inspiration: https://github.com/electron/get

[timsuchanek]

Most of these problems are now tackled with https://github.com/prisma/prisma2/issues/1593

• We're using binaries.prisma.sh
• It's a CloudFront distribution in front of the S3 bucket