fix: rename event module into analytics and clean (#482)

server/src/core/analytics/analytics.module.ts

@@ -0,0 +1,8 @@
+import { Module } from '@nestjs/common';
+import { AnalyticsService } from './analytics.service';
+import { AnalyticsResolver } from './analytics.resolver';
+
+@Module({
+  providers: [AnalyticsResolver, AnalyticsService],
+})
+export class AnalyticsModule {}