add Medusa Cloud Email provider (#13781)

* add Medusa Cloud Email provider

* move cloud config to project level

* add tests

* Create breezy-flowers-fly.md

* rename medusa_cloud_config to cloud

---------

Co-authored-by: Oli Juhl <59018053+olivermrbl@users.noreply.github.com>

.changeset/breezy-flowers-fly.md

@@ -0,0 +1,8 @@
+---
+"@medusajs/notification": patch
+"@medusajs/payment": patch
+"@medusajs/types": patch
+"@medusajs/utils": patch
+---
+
+add Medusa Cloud Email provider