refactor(server): plugin modules (#5630)

- [x] separates modules into `fundamental`, `core`, `plugins`
- [x] optional modules with `@OptionalModule` decorator to install modules with requirements met(`requires`, `if`)
- [x] `module.contributesTo` defines optional features that will be enabled if module registered
- [x] `AFFiNE.plugins.use('payment', {})` to enable a optional/plugin module
- [x] `PaymentModule` is the first plugin module
- [x] GraphQLSchema will not be generated for non-included modules
- [x] Frontend can use `ServerConfigType` query to detect which features are enabled
- [x] override existing provider globally

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

@@ -7,9 +7,9 @@ import { PrismaClient } from '@prisma/client';
 import ava, { type TestFn } from 'ava';
 
 import { AppModule } from '../src/app.module';
+import { FeatureKind, FeatureManagementService } from '../src/core/features';
+import { Quotas } from '../src/core/quota';
 import { MailService } from '../src/fundamentals/mailer';
-import { FeatureKind, FeatureManagementService } from '../src/modules/features';
-import { Quotas } from '../src/modules/quota';
 import {
   createTestingApp,
   createWorkspace,