Support for setting array options via CL and env

### Environment variables

In environment variables, array values can be specified with valid JSON string:

```
COMMIT_TYPES_EXCLUDED_FROM_TAG_MESSAGE=["fix", "feat"]
```

### CL args

With command line, the same key can be passed multiple times with different values and they will be collected (works both with options and long options):

```bash
priestine-semantics -e fix -e feat
```