begin: collapse sequence of Requests/Closes

[glazychev-art]

Overview

If we have a set of similar Requests/Closes queued at the eventFactory executor, we can only run the first one and simply reuse the result for the others. In other words, collapse the sequence

[glazychev-art]

TODO: Check the problem on the current main branch - run vl3-network with many clients Positive: create synthetic test before/after Negative: this is low priority issue