feat(veryl): report per-test simulation-only time in --format json

[dalance]

No description provided.

[codspeed-hq]

Merging this PR will not alter performance

✅ 8 untouched benchmarks

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_{Comparing feat/test-json-sim-time (1f129a3) with master (537f9c2)¹}

Footnotes

1. No successful run was found on master (1f129a3) during the generation of this report, so 537f9c2 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩