enhance(test-benchmark): use config file for fixed opcode count scenarios

[spencer-tb]

🗒️ Description

Follow up to #1747
Adds a python config file to allow us to use multiple differing opcodes counts for each scenario on the fly.

This PR is a WIP.

🔗 Related Issues or PRs

N/A.

✅ Checklist

• All: Ran fast tox checks to avoid unnecessary CI fails, see also Code Standards and Enabling Pre-commit Checks:

  uvx tox -e static

• All: PR title adheres to the repo standard - it will be used as the squash commit message and should start type(scope):.
• All: Considered adding an entry to CHANGELOG.md.
• All: Considered updating the online docs in the ./docs/ directory.
• All: Set appropriate labels for the changes (only maintainers can apply labels).

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