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/src/fundamentals/websocket/index.ts

@@ -1 +1,17 @@
-export { RedisIoAdapter } from './redis-adapter';
+import { Module, Provider } from '@nestjs/common';
+import { IoAdapter } from '@nestjs/platform-socket.io';
+
+export const SocketIoAdapterImpl = Symbol('SocketIoAdapterImpl');
+
+export class SocketIoAdapter extends IoAdapter {}
+
+const SocketIoAdapterImplProvider: Provider = {
+  provide: SocketIoAdapterImpl,
+  useValue: SocketIoAdapter,
+};
+
+@Module({
+  providers: [SocketIoAdapterImplProvider],
+  exports: [SocketIoAdapterImplProvider],
+})
+export class WebSocketModule {}