[NestJS] Global prefix support (#592)

* Added support for global prefix in NestJS

* Code style changes for setting global prefix in NestJS module

packages/nestjs/src/bull-board.root-module.ts

@@ -2,21 +2,23 @@ import { DynamicModule, Inject, MiddlewareConsumer, Module, NestModule, Provider
 import { createBullBoard } from "@bull-board/api";
 import { BULL_BOARD_ADAPTER, BULL_BOARD_INSTANCE, BULL_BOARD_OPTIONS } from "./bull-board.constants";
 import { BullBoardModuleOptions, BullBoardServerAdapter } from "./bull-board.types";
-import { HttpAdapterHost } from "@nestjs/core";
+import { ApplicationConfig, HttpAdapterHost } from "@nestjs/core";
 import { isExpressAdapter, isFastifyAdapter } from "./bull-board.util";
 
 @Module({})
 export class BullBoardRootModule implements NestModule {
 
   constructor(
     private readonly adapterHost: HttpAdapterHost,
+    private readonly applicationConfig: ApplicationConfig,
     @Inject(BULL_BOARD_ADAPTER) private readonly adapter: BullBoardServerAdapter,
     @Inject(BULL_BOARD_OPTIONS) private readonly options: BullBoardModuleOptions
   ) {
   }
 
   configure(consumer: MiddlewareConsumer): any {
-    this.adapter.setBasePath(this.options.route);
+    const globalPrefix = this.applicationConfig.getGlobalPrefix() || '';
+    this.adapter.setBasePath(`${ globalPrefix }${ this.options.route }`);
 
     if (isExpressAdapter(this.adapter)) {
       return consumer