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Title: Add optional high‑performance counter backend using babylon

Title: Add optional high‑performance counter backend using babylon: a task in LegoFlow-SWE (Harbor dataset). We want to give users the option to build bvar with a high‑performance backend that uses the babylon library’s lock‑free concurrent counters. The feature should be controlled by a build…

The task

We want to give users the option to build bvar with a high‑performance backend that uses the **babylon** library’s lock‑free concurrent counters. The feature should be controlled by a build flag: `--define with_babylon_counter=true`

Part of Lego-X/LegoFlow-SWE.