[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
```

Start at the CLI handling for the -c option and trace how the current single YAML configuration is applied. Verify the behavior with the command shown in the issue; done means repeated -c arguments are accepted and applied in the supplied order, matching the equivalent pipeline.

Written by the indexing model from the issue text.