Oauth2 Callback Handler

curl --request GET \
  --url http://localhost:8000/v1/auth/sso/oauth2/callback

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "email": "<string>",
  "first_name": "<string>",
  "last_name": "<string>",
  "current_tenant_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "default_tenant_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}