feat(custom-domains): allow to register a custom domain (without UI) (#9879)

# In this PR
- Allow to register a custom domain
- Refacto subdomain generation

# In other PRs
- Add UI to deal with a custom domain
- Add logic to work with custom domain

packages/twenty-server/package.json

@@ -30,6 +30,7 @@
     "cache-manager": "^5.4.0",
     "cache-manager-redis-yet": "^4.1.2",
     "class-validator": "patch:class-validator@0.14.0#./patches/class-validator+0.14.0.patch",
+    "cloudflare": "^3.5.0",
     "connect-redis": "^7.1.1",
     "express-session": "^1.18.1",
     "graphql-middleware": "^6.1.35",