newman-allure: provide requests as curl

**Is your feature request related to a problem? Please describe.**
Not a problem, more a QOL feature.
When tests are failing in CI/Jenkins and the issues is not test related, the efforts to get a curl command and to hand it over to a dev for debugging purpose is too high.

**Describe the solution you'd like**
I would like to have curl commands of the requests attached to the tests in allure.

**Describe alternatives you've considered**
Starting postma, find the corresponding collection/request and get the command.

**Additional context**
N/A

If this feature gets accepted (and my current PR moves forward), I can also have a look into it.

No files or tests are named in the issue. Start by locating the Newman integration and the Allure attachment generation, then determine how each test request is represented. Done means the requests attached to Allure tests can also be copied or viewed as curl commands.

Written by the indexing model from the issue text.