lib/plugins/aws/provider/awsProvider.js/AwsProvider/getApiGatewayWebsocketApiId
class AwsProvider:  getApiGatewayWebsocketApiId() {
    if (
      this.serverless.service.provider.apiGateway &&
      this.serverless.service.provider.apiGateway.websocketApiId
    ) {
      return this.serverless.service.provider.apiGateway.websocketApiId;
    }

    return { Ref: this.naming.getWebsocketsApiLogicalId() };
  }