refactor(server): auth (#5895)

Remove `next-auth` and implement our own Authorization/Authentication system from scratch.

## Server

- [x] tokens
  - [x] function
  - [x] encryption

- [x] AuthController
  - [x] /api/auth/sign-in
  - [x] /api/auth/sign-out
  - [x] /api/auth/session
  - [x] /api/auth/session (WE SUPPORT MULTI-ACCOUNT!)

- [x] OAuthPlugin
  - [x] OAuthController
  - [x] /oauth/login
  - [x] /oauth/callback
  - [x] Providers
    - [x] Google
    - [x] GitHub

## Client

- [x] useSession
- [x] cloudSignIn
- [x] cloudSignOut

## NOTE:

Tests will be adding in the future

packages/backend/server/tests/mailer.e2e.ts

@@ -21,15 +21,7 @@ const test = ava as TestFn<{
 
 test.beforeEach(async t => {
   t.context.module = await createTestingModule({
-    imports: [
-      ConfigModule.forRoot({
-        auth: {
-          accessTokenExpiresIn: 1,
-          refreshTokenExpiresIn: 1,
-          leeway: 1,
-        },
-      }),
-    ],
+    imports: [ConfigModule.forRoot({})],
   });
   t.context.auth = t.context.module.get(AuthService);
 });