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/src/plugins/oauth/providers/def.ts

@@ -0,0 +1,21 @@
+import { OAuthProviderName } from '../types';
+
+export interface OAuthAccount {
+  id: string;
+  email: string;
+  avatarUrl?: string;
+}
+
+export interface Tokens {
+  accessToken: string;
+  scope?: string;
+  refreshToken?: string;
+  expiresAt?: Date;
+}
+
+export abstract class OAuthProvider {
+  abstract provider: OAuthProviderName;
+  abstract getAuthUrl(state?: string): string;
+  abstract getToken(code: string): Promise<Tokens>;
+  abstract getUser(token: string): Promise<OAuthAccount>;
+}