Option to only output the request

[ngudbhav]

This is not a bug but a feature request.

Sometimes, it is essential to print the resultant request instead of firing it. One use case is to import the resultant request into Postman for further manipulation or debugging. Another use case can be to keep the curl command handy for learning purposes.

Please let me know if this idea sounds good and if I can pick it up. We can use a flag --dry-run or any similar flag.