Debug flag exists in robo generate:tests to print action sequence of test steps

[okolesnyk]

As a test developer
I want a debug flag which I can provide during single test generation which prints each stepKey, action name and originating file
so that I can clearly see how MFTF is rendering resulting tests

AC:

1. Debug flag exists printing steps for a single test in order they would appear generated with information out to console:
   - stepKey name
   - action name
   - originating file