feat: role management page with component tree (#5675)

* feat: add shadcn tree

* fix: update vbenTree component

* feat: role management demo page

* feat: add cellSwitch renderer for vxeTable

* chore: remove tree examples

playground/src/api/index.ts

@@ -1,2 +1,3 @@
 export * from './core';
 export * from './examples';
+export * from './system';