use health package, upgrade ddd library, improve integration tests

src/modules/messager/messager.di-tokens.ts

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+export const MESSAGE_PUBLISHER = Symbol('MESSAGE_PUBLISHER');

src/modules/messager/messager.module.ts

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+import { Module, Provider } from '@nestjs/common';
+import { MESSAGE_PUBLISHER } from './messager.di-tokens';
+import {
+  MessageBrokerModule,
+  MessageBrokerModuleOptions,
+  MessageBrokerPublisher,
+} from '@mobicoop/message-broker-module';
+import { ConfigModule, ConfigService } from '@nestjs/config';
+
+const imports = [
+  MessageBrokerModule.forRootAsync({
+    imports: [ConfigModule],
+    inject: [ConfigService],
+    useFactory: async (
+      configService: ConfigService,
+    ): Promise<MessageBrokerModuleOptions> => ({
+      uri: configService.get<string>('MESSAGE_BROKER_URI'),
+      exchange: configService.get<string>('MESSAGE_BROKER_EXCHANGE'),
+      name: 'ad',
+    }),
+  }),
+];
+
+const providers: Provider[] = [
+  {
+    provide: MESSAGE_PUBLISHER,
+    useClass: MessageBrokerPublisher,
+  },
+];
+
+@Module({
+  imports,
+  providers,
+  exports: [MESSAGE_PUBLISHER],
+})
+export class MessagerModule {}