refactor(auth): move auth into core module

src/app/@core/core.module.ts

@@ -1,17 +1,34 @@
 import { ModuleWithProviders, NgModule, Optional, SkipSelf } from '@angular/core';
 import { CommonModule } from '@angular/common';
+import { NbAuthModule, NbDummyAuthProvider } from '@nebular/auth';
 
 import { throwIfAlreadyLoaded } from './module-import-guard';
 import { DataModule } from './data/data.module';
 
 const NB_CORE_PROVIDERS = [
   ...DataModule.forRoot().providers,
+  ...NbAuthModule.forRoot({
+    providers: {
+      email: {
+        service: NbDummyAuthProvider,
+        config: {
+          delay: 1000,
+          login: {
+            rememberMe: true,
+          },
+        },
+      },
+    },
+  }).providers,
 ];
 
 @NgModule({
   imports: [
     CommonModule,
   ],
+  exports: [
+    NbAuthModule,
+  ],
   declarations: [],
 })
 export class CoreModule {