feat: Add support for authentication to the sdk, and plug it in the admin (#7349)

* feat: Add support for authentication to the sdk, and plug it in the admin

* fix: await fetch before returning in sdk

.changeset/little-books-reply.md

@@ -19,7 +19,6 @@
 "@medusajs/ui-preset": patch
 "@medusajs/medusa": patch
 "medusa-core-utils": patch
-"medusa-interfaces": patch
 "medusa-telemetry": patch
 "@medusajs/api-key": patch
 "@medusajs/auth": patch