Support for processing entire folder or wildcard

Rather than using
```
python -m actions_includes ./.github/src/my-action.yml ./.github/workflows/my-action.yml
```
individually for each action, it would be nice if it supported folders, such as:
```
python -m actions_includes ./.github/src ./.github/workflows
```
or wildcards:
```
python -m actions_includes ./.github/src/*.yml ./.github/workflows/*.yml
```