feat(editor): support member node (#11075)

Close [BS-2793](https://linear.app/affine-design/issue/BS-2793/inline-member)

blocksuite/affine/shared/src/types/index.ts

@@ -73,6 +73,10 @@ export interface AffineTextAttributes {
   color?: string | null;
   latex?: string | null;
   footnote?: FootNote | null;
+  mention?: {
+    member: string;
+    notification: string;
+  } | null;
 }
 
 export type AffineInlineEditor = InlineEditor<AffineTextAttributes>;