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-front/src/modules/workspace/graphql/mutations/updateWorkspace.ts

@@ -4,6 +4,7 @@ export const UPDATE_WORKSPACE = gql`
   mutation UpdateWorkspace($input: UpdateWorkspaceInput!) {
     updateWorkspace(data: $input) {
       id
+      hostname
       subdomain
       displayName
       logo

packages/twenty-front/src/modules/workspace/graphql/queries/getHostnameDetails.ts

@@ -0,0 +1,22 @@
+import { gql } from '@apollo/client';
+
+export const GET_HOSTNAME_DETAILS = gql`
+  query GetHostnameDetails {
+    getHostnameDetails {
+      hostname
+      ownershipVerifications {
+        ... on CustomHostnameOwnershipVerificationTxt {
+          type
+          name
+          value
+        }
+        ... on CustomHostnameOwnershipVerificationHttp {
+          type
+          body
+          url
+        }
+      }
+      status
+    }
+  }
+`;