feat(admin, admin-ui, medusa-js, medusa-react, medusa): Support Admin Extensions (#4761)

Co-authored-by: Rares Stefan <948623+StephixOne@users.noreply.github.com>
Co-authored-by: Oli Juhl <59018053+olivermrbl@users.noreply.github.com>

packages/admin-ui/ui/tsconfig.json

@@ -10,6 +10,7 @@
     "allowSyntheticDefaultImports": true,
     "strict": true,
     "forceConsistentCasingInFileNames": true,
+    "sourceMap": true,
     "module": "ESNext",
     "moduleResolution": "Node",
     "resolveJsonModule": true,