Wait for callback instead of retrying while waiting for child object

see `getChildObject` in `base_interface.ts`
```ts
if (options.maxRetries > 0) {
            await sleep(options.retryIntervalMs)
            options.maxRetries--
            return this.getChildObject(interfaceName, constructor, filter, options)
}
```
better way to do it by checking incoming `InterfacesAdded` events instead