Can Server call Client defined Service?

[Krosxx]

Is your feature request related to a problem? Please describe.
Can KtorRpcClient registerService, KrpcRoute withService, i.e. Server call Client defined Service?

Describe the solution you'd like

In KrpcClient:

    val rpcClient = client.rpc {
        url("ws://localhost:8080/rpc")
        rpcConfig { serialization { json() } }
    }
    rpcClient.registerService<ClientService> { ClientServiceImpl() }

In KrpcServer:

    routing {
        rpc("/rpc") {
            rpcConfig { serialization { json() } }
            // 获取客户端注册的 Service
            val clientService = withService<ClientService>()
            // 服务器调用客户端的 Service 方法
            val response = clientService.notify("Hello from server!")
            println("Client responded: $response")
        }
     }

[Mr3zee]

Hi! Thank you for the issue! That's an interesting approach to the design of the this issue, that we'll consider.

While we are on it, could you tell me if this issue also fits your use-case or maybe there are some differences: #341 (comment)