feat: add Medusa Cloud OAuth provider (#14395)

* feat: add Medusa Cloud OAuth provider

* add Cloud login button

* fetch whether cloud auth is enabled through api

* allow unregistered to get session

* handle existing users

* address PR comments

* prevent double execution

* a few more fixes

* fix callback url

* fix spelling

* refresh session

* 200 instead of 201

* only allow cloud identities to create user

* fix condition

.eslintrc.js

@@ -256,6 +256,7 @@ module.exports = {
       },
       globals: {
         __BASE__: "readonly",
+        __AUTH_TYPE__: "readonly",
       },
       env: {
         browser: true,