chore: Remove medusa interfaces package (#7347)

packages/medusa/index.d.ts

@@ -1 +0,0 @@
-declare module "medusa-interfaces"

packages/medusa/package.json

@@ -31,7 +31,6 @@
     "@types/multer": "^1.4.7",
     "cross-env": "^5.2.1",
     "jest": "^25.5.4",
-    "medusa-interfaces": "^1.3.9",
     "medusa-test-utils": "^1.1.44",
     "rimraf": "^5.0.1",
     "supertest": "^4.0.2",
@@ -45,9 +44,6 @@
     "serve": "node dist/app.js",
     "test": "jest --silent --bail --maxWorkers=50% --forceExit"
   },
-  "peerDependencies": {
-    "medusa-interfaces": "^1.3.7"
-  },
   "dependencies": {
     "@medusajs/admin-sdk": "0.0.1",
     "@medusajs/core-flows": "^0.0.9",