feat(weave): add non-adversarial robustness scorer

[ayulockin]

• Adds a scorer to measure the robustness of LLM system.

[github-actions]

CLA Assistant Lite bot:
Thank you for your submission, we really appreciate it. Like many open-source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution. You can sign the CLA by just posting a Pull Request Comment same as the below format.

---

I have read the CLA Document and I hereby sign the CLA

---

3 out of 4 committers have signed the CLA.
✅ @ayulockin
✅ @J2-D2-3PO
✅ @domphan-wandb
❌ @weave Build Bot
Weave Build Bot seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You can retrigger this bot by commenting recheck in this Pull Request}