Add support for collection-run iterations in batches while in parallel mode, with a user-defined batch size

[sreelakshmi-bruno]

I have checked the following:

• I use the newest version of bruno.
• I've searched existing issues and found nothing related to my issue.

Describe the bug

It would be helpful to have a way to run multiple iterations of a single/a bunch of requests, when trying to tune an individual/a set of operations. For this we need to have a numeric input for parallel request count. If I feed a csv file with 200 rows into the runner with a parallel request count of 10 they would run in batches of 10.
Refer to #2251 for the discussion

.bru file to reproduce the bug

No response

Screenshots/Live demo link

NA