Using setup and/or init

[strowk]

Feature Description

We should be able to instruct our scripts to do some weighty operation that we do not want to load test (such as f.e login) in the beginning of test once.
Such approach would also require, however, reusing the same page between iterations, which I am not so sure how to do right now.

Suggested Solution (optional)

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Already existing or connected issues / PRs (optional)

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