Add support for ClientsModule.register

[dPreininger]

When talking about ClientsModule, I mean the one exported from @nestjs/microservices package.

Currently, ClientsModule.register call does not support this package. It would be good to support it tho because it would make migrating between different message brokers very easy.

If agreed, I could make a PR that would add the support.

[dPreininger]

I figured out this is already supported using customClass field in ClientsModule.register options.

[nvdnkpr]

@dPreininger do you have any code example ? I am struggeling with creating a pub sub client with ClientsModule.register...

[dPreininger]

The important part is that you use the customClass property. Double check if the options are correct as I have written them by hand (didn't copy paste the actual code)

ClientsModule.register([
    	{
    	    name: 'injection-token-name',
    	    cutomClass: GCPubSubClient,
    	    options: {
    	        topic: 'your-topic',
    	        client: {
    	            projectId: 'your-id',
    	        },
    	    },
    	}
    ]);