Ordering built-in and custom data providers (#414)

So custom data providers could be executed after built-in data providers. This will allow not only create additional resources, but also update resources (already) generated by Allure standard data providers.

I didn't want to add explicit ordering in data providers. Data provider dependency management is also an overkill IMO. So, there are minimal changes to add ordering required.

Thoughts?
> Whats mean "default"?) In general its "process-testpack" phase.
> 
> Or "process-results"
> 
> or just "process"

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