Support terminus library

[juandav]

nestjs/terminus#1288 (comment)

[juandav]

This proposal is already usable, but I look forward to suggestions on how we can improve it.

How to use the Redis indicator for the Terminus library?"

//health.module.ts
import { Module } from '@nestjs/common';
import { TerminusModule } from '@nestjs/terminus';
import { RedisHealthModule, } from '@nestjs-modules/ioredis';

@Module({
  imports: [TerminusModule, RedisHealthModule],
  controllers: [HealthController]
})
export class HealthModule {}

//health.controller.ts
import { Controller, Get } from '@nestjs/common';
import {
  HealthCheckService,
  HealthCheck,
  HealthCheckResult
} from '@nestjs/terminus';
import { RedisHealthIndicator } from './redis.health';

@Controller('health')
export class HealthController {
  constructor(
    private health: HealthCheckService,
    private redis: RedisHealthIndicator,
  ) {}

  @Get()
  @HealthCheck()
  check(): Promise<HealthCheckResult> {
    return this.health.check([
      async () => this.redis.isHealthy('redis'),
    ]);
  }
}