Provide concept of blocking operations

[AmyKosinova]

Similar to "wait until" for web steps, it is essential for some tests to have blocking operation until system is in certain state.
This should be extensible and easily configurable, like concept of Commands.

[AmyKosinova]

Revisiting after triage 20.2.2019
Implement steps per area (SQL, WS...) Repeat last [APP] request until response matches...

[paveljandejsek]

Did we encounter real use case apart of SQL waits? I can understand lots of them, but havent seen anything else than SQL in the couple of years since we had this open (which should be pretty easily solvable by custom step + awaitility or something among those lines). So maybe potential candidate for closing?

[paveljandejsek]

Update 2021-09-01 - maybe we could provide SQL specific implementation (and if no one does, then close it alltogether)

[paveljandejsek]

Update 2023-01-04 - We will implement SQL specific step without any general support.