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/resolver.ts

@@ -0,0 +1,17 @@
+import { registerEnumType, ResolveField, Resolver } from '@nestjs/graphql';
+
+import { ServerConfigType } from '../../core/config';
+import { OAuthProviderFactory } from './register';
+import { OAuthProviderName } from './types';
+
+registerEnumType(OAuthProviderName, { name: 'OAuthProviderType' });
+
+@Resolver(() => ServerConfigType)
+export class OAuthResolver {
+  constructor(private readonly factory: OAuthProviderFactory) {}
+
+  @ResolveField(() => [OAuthProviderName])
+  oauthProviders() {
+    return this.factory.providers;
+  }
+}