Add command line executable for cwl-parsl

Create and add a new command line executable for cwl-parsl

Example usage
```python3 parsl_cwl_tool.py <cwl_file> <yaml_io>```

or

```python3 parsl_cwl_tool.py <CWL_FILE> --<Input1>=<Value1> --<Input2>=<Value2> ...--stdout=<Value3> ...```