Move frontend types into it's own package for a single source of truth

Core/Client/src/types/plugins.d.ts

@@ -1,21 +1,14 @@
 import type * as Vue from 'vue'
 import type * as VueRouter from 'vue-router'
 import type * as PiniaLib from 'pinia'
+import 'medusa-plugin-types'
 
-export interface PluginExportMap {
-  [componentKey: string]: Vue.Component
-}
-
-export interface MedusaHostHelpers {
-  getAccessToken: () => string | null
-}
+export type { PluginExportMap, MedusaHostHelpers } from 'medusa-plugin-types'
 
 declare global {
   interface Window {
     __medusa_vue__:     typeof Vue
     __medusa_router__:  typeof VueRouter
     __medusa_pinia__:   typeof PiniaLib
-    __medusa_plugins__: Record<string, PluginExportMap>
-    __medusa_host__:    MedusaHostHelpers
   }
-}
+}