chore(server): setup winston logger (#9561)

There is no impact on the existing logger, as the current logger is used with `new Logger(Context)` and does not utilize dependency injection. In the next phase, gradually replace and supplement the existing `Logger`.

packages/backend/server/src/base/logger/service.ts

@@ -0,0 +1,30 @@
+import { LoggingWinston } from '@google-cloud/logging-winston';
+import { ConsoleLogger, LoggerService, Provider, Scope } from '@nestjs/common';
+import { createLogger, transports } from 'winston';
+
+import { Config } from '../config';
+import { AFFiNELogger } from './logger';
+
+export const loggerProvider: Provider<LoggerService> = {
+  provide: AFFiNELogger,
+  useFactory: (config: Config) => {
+    if (config.NODE_ENV !== 'production') {
+      return new ConsoleLogger();
+    }
+    const loggingWinston = new LoggingWinston();
+    // Create a Winston logger that streams to Cloud Logging
+    const instance = createLogger({
+      level: config.affine.stable ? 'log' : 'verbose',
+      transports: [
+        new transports.Console(),
+        // Add Cloud Logging
+        loggingWinston,
+      ],
+    });
+    return new AFFiNELogger(instance);
+  },
+  inject: [Config],
+  // use transient to make sure the logger is created for each di context
+  // to make the `setContext` method works as expected
+  scope: Scope.TRANSIENT,
+};