feat(admin-sdk,admin-bundler,admin-shared,medusa): Restructure admin packages (#8988)

**What**
- Renames /admin-next -> /admin
- Renames @medusajs/admin-sdk -> @medusajs/admin-bundler
- Creates a new package called @medusajs/admin-sdk that will hold all tooling relevant to creating admin extensions. This is currently `defineRouteConfig` and `defineWidgetConfig`, but will eventually also export methods for adding custom fields, register translation, etc. 
  - cc: @shahednasser we should update the examples in the docs so these functions are imported from `@medusajs/admin-sdk`. People will also need to install the package in their project, as it's no longer a transient dependency.
  - cc: @olivermrbl we might want to publish a changelog when this is merged, as it is a breaking change, and will require people to import the `defineXConfig` from the new package instead of `@medusajs/admin-shared`.
- Updates CODEOWNERS so /admin packages does not require a review from the UI team.

packages/admin/dashboard/src/lib/query-key-factory.ts

@@ -0,0 +1,54 @@
+import { QueryKey, UseQueryOptions } from "@tanstack/react-query"
+
+export type TQueryKey<TKey, TListQuery = any, TDetailQuery = string> = {
+  all: readonly [TKey]
+  lists: () => readonly [...TQueryKey<TKey>["all"], "list"]
+  list: (
+    query?: TListQuery
+  ) => readonly [
+    ...ReturnType<TQueryKey<TKey>["lists"]>,
+    { query: TListQuery | undefined },
+  ]
+  details: () => readonly [...TQueryKey<TKey>["all"], "detail"]
+  detail: (
+    id: TDetailQuery,
+    query?: TListQuery
+  ) => readonly [
+    ...ReturnType<TQueryKey<TKey>["details"]>,
+    TDetailQuery,
+    { query: TListQuery | undefined },
+  ]
+}
+
+export type UseQueryOptionsWrapper<
+  // Return type of queryFn
+  TQueryFn = unknown,
+  // Type thrown in case the queryFn rejects
+  E = Error,
+  // Query key type
+  TQueryKey extends QueryKey = QueryKey,
+> = Omit<
+  UseQueryOptions<TQueryFn, E, TQueryFn, TQueryKey>,
+  "queryKey" | "queryFn"
+>
+
+export const queryKeysFactory = <
+  T,
+  TListQueryType = any,
+  TDetailQueryType = string,
+>(
+  globalKey: T
+) => {
+  const queryKeyFactory: TQueryKey<T, TListQueryType, TDetailQueryType> = {
+    all: [globalKey],
+    lists: () => [...queryKeyFactory.all, "list"],
+    list: (query?: TListQueryType) => [...queryKeyFactory.lists(), { query }],
+    details: () => [...queryKeyFactory.all, "detail"],
+    detail: (id: TDetailQueryType, query?: TListQueryType) => [
+      ...queryKeyFactory.details(),
+      id,
+      { query },
+    ],
+  }
+  return queryKeyFactory
+}