[PROPOSAL] Pass multiple masking config to the command line

Possibility to pass multiple yaml configuration, that will be applied in the order provided by command line arguments

```console
$ cat data.jsonl | pimo -c format.yml -c clean.yml -c masking.yml
```

Equivalent to 

```console
$ cat data.jsonl | pimo -c format.yml | pimo -c clean.yml | pimo -c masking.yml
```