Implement create-notebook CLI command

### Why it needs to get done

DSS should be able to create a jupyter server.

### What needs to get done

With DSS I can run `dss create-notebook` command which will create a jupyter notebook and will output its URL for access. The command has two arguments:

- `--notebook-name`: A name related with the server.
- `--notebook-image`: An image which will be main image of the server pod.

### When is the task considered done

User can run e.g.:

```
dss create-notebook --name user-notebook --notebook-image kubeflownotebookswg/jupyter-scipy:v1.8.0
```

this command will create jupyter server with name `user-notebook` and will output URL for accessing the notebook e.g.:
```
Access the notebook at http://10.152.183.223/notebook/user-namespace/user-notebook/
```