feat(editor): put current user in first on database user select (#13320)

blocksuite/affine/shared/src/services/user-service/user-service.ts

@@ -5,6 +5,7 @@ import type { Signal } from '@preact/signals-core';
 import type { AffineUserInfo } from './types';
 
 export interface UserService {
+  currentUserInfo$: Signal<AffineUserInfo | null>;
   userInfo$(id: string): Signal<AffineUserInfo | null>;
   isLoading$(id: string): Signal<boolean>;
   error$(id: string): Signal<string | null>; // user friendly error string